LLMS_Student

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Description Description

Manages data and interactions with a LifterLMS Student.
Source Source

File: includes/models/model.llms.student.php
*/
class LLMS_Student extends LLMS_Abstract_User_Data {
 
    use LLMS_Trait_Student_Awards;
 
    /**
     * Retrieve an instance of the LLMS_Instructor model for the current user
     *
     * @return   LLMS_Instructor|false
     * @since    3.14.0
     * @version  3.14.0
     */
    public function instructor() {
        if ( $this->is_instructor() ) {
            return llms_get_instructor( $this->get_id() );
        }
        return false;
    }
 
    /**
     * Retrieve an instance of the student quiz data model
     *
     * @return   LLMS_Student_Quizzes
     * @since    3.9.0
     * @version  3.9.0
     */
    public function quizzes() {
        return new LLMS_Student_Quizzes( $this->get_id() );
    }
 
    /**
     * Add the student to a LifterLMS Membership
     *
     * @param int $membership_id   WP Post ID of the membership
     * @return  void
     *
     * @since  2.2.3
     */
    private function add_membership_level( $membership_id ) {
 
        // Add the user to the membership level.
        $membership_levels = $this->get_membership_levels();
        array_push( $membership_levels, $membership_id );
        update_user_meta( $this->get_id(), '_llms_restricted_levels', $membership_levels );
 
        // If there's auto-enroll courses, enroll the user in those courses.
        $autoenroll_courses = get_post_meta( $membership_id, '_llms_auto_enroll', true );
        if ( $autoenroll_courses ) {
 
            foreach ( $autoenroll_courses as $course_id ) {
 
                $this->enroll( $course_id, 'membership_' . $membership_id );
 
            }
        }
 
    }
 
    /**
     * Enroll the student into a course or membership
     *
     * @since 2.2.3
     * @since 3.17.0 Unknown.
     * @since 3.34.0 Added new actions to differentiate between first-time enrollment and enrollment status updates.
     * @since 3.37.9 Added filter `llms_user_enrollment_allowed_post_types` to customize the post types a user can be enrolled into.
     * @since 4.4.1 Moved filter `llms_user_enrollment_allowed_post_types` to function `llms_get_enrollable_post_types()`.
     *
     * @see llms_enroll_student()
     *
     * @param  int    $product_id WP Post ID of the course or membership
     * @param  string $trigger    String describing the reason for enrollment
     * @return bool
     */
    public function enroll( $product_id, $trigger = 'unspecified' ) {
 
        /**
         * Fires before a user is enrolled into a course or membership.
         *
         * @param int $user_id WP User ID.
         * @param int $product_id WP Post ID of the course or membership.
         */
        do_action( 'before_llms_user_enrollment', $this->get_id(), $product_id );
 
        // Users can only be enrolled into the following post types.
        if ( ! in_array( get_post_type( $product_id ), llms_get_enrollable_post_types(), true ) ) {
            return false;
        }
 
        // Check enrollment before enrolling to prevent duplicates.
        if ( llms_is_user_enrolled( $this->get_id(), $product_id ) ) {
            return false;
        }
 
        // If the student has been previously enrolled, simply update don't run a full enrollment.
        if ( $this->get_enrollment_status( $product_id, false ) ) {
            $insert      = $this->insert_status_postmeta( $product_id, 'enrolled', $trigger );
            $action_type = 'updated';
        } else {
            $insert      = $this->insert_enrollment_postmeta( $product_id, $trigger );
            $action_type = 'created';
        }
 
        // Add the user postmeta for the enrollment.
        if ( ! empty( $insert ) ) {
 
            // Update the cache.
            $this->cache_set( sprintf( 'enrollment_status_%d', $product_id ), 'enrolled' );
            $this->cache_delete( sprintf( 'date_enrolled_%d', $product_id ) );
            $this->cache_delete( sprintf( 'date_updated_%d', $product_id ) );
 
            $post_type = str_replace( 'llms_', '', get_post_type( $product_id ) );
 
            if ( 'course' === $post_type ) {
 
                /**
                 * Fires after a user is enrolled in course
                 *
                 * @param int $user_id    WP User ID.
                 * @param int $product_id WP Post ID of the course or membership.
                 */
                do_action( 'llms_user_enrolled_in_course', $this->get_id(), $product_id );
 
            } elseif ( 'membership' === $post_type ) {
 
                $this->add_membership_level( $product_id );
 
                /**
                 * Fires after a user is enrolled in membership
                 *
                 * @param int $user_id    WP User ID.
                 * @param int $product_id WP Post ID of the course or membership.
                 */
                do_action( 'llms_user_added_to_membership_level', $this->get_id(), $product_id );
 
            }
 
            /**
             * Fires after a user's enrollment is created or updated.
             *
             * `$post_type` refers to the type of item the user is enrolled in, either 'course' or 'membership'
             * `$action_type` refers to the type of action taking place, either "created" or "updated".
             *
             * @param int $user_id WP User ID.
             * @param int $product_id WP Post ID of the course or membership.
             */
            do_action( "llms_user_{$post_type}_enrollment_{$action_type}", $this->get_id(), $product_id );
 
            return true;
 
        }
 
        return false;
 
    }
 
    public function get_avatar( $size = 96 ) {
        return '<span class="llms-student-avatar">' . get_avatar( $this->get_id(), $size, null, $this->get_name() ) . '</span>';
    }
 
    /**
     * Retrieve the order which enrolled a student in a given course or membership.
     *
     * Retrieves the most recently updated order for the given product.
     *
     * @since 3.0.0
     * @since 5.7.0 Replaced the call to the deprecated `LLMS_Lesson::get_parent_course()` method with `LLMS_Lesson::get( 'parent_course' )`.
     *
     * @param int $product_id WP Post ID of the LifterLMS Product (course, lesson, or membership)
     * @return LLMS_Order|false Instance of the LLMS_Order or false if none found
     */
    public function get_enrollment_order( $product_id ) {
 
        // If a lesson id was passed in, cascade up to the course for order retrieval.
        if ( 'lesson' === get_post_type( $product_id ) ) {
            $lesson     = new LLMS_Lesson( $product_id );
            $product_id = $lesson->get( 'parent_course' );
        }
 
        // Attempt to locate the order via the enrollment trigger.
        $trigger = $this->get_enrollment_trigger( $product_id );
        if ( strpos( $trigger, 'order_' ) !== false ) {
 
            $id = str_replace( array( 'order_', 'wc_' ), '', $trigger );
            if ( is_numeric( $id ) ) {
                if ( 'llms_order' === get_post_type( $id ) ) {
                    return new LLMS_Order( $id );
                } else {
 
                    return get_post( $id );
                }
            }
        }
 
        // Couldn't find via enrollment trigger, do a WP_Query.
        $q = new WP_Query(
            array(
                'order'          => 'DESC',
                'orderby'        => 'modified',
                'meta_query'     => array(
                    'relation' => 'AND',
                    array(
                        'key'   => '_llms_user_id',
                        'value' => $this->get_id(),
                    ),
                    array(
                        'key'   => '_llms_product_id',
                        'value' => $product_id,
                    ),
                ),
                'posts_per_page' => 1,
                'post_type'      => 'llms_order',
            )
        );
 
        if ( $q->have_posts() ) {
            return new LLMS_Order( $q->posts[0] );
        }
 
        // Couldn't find an order, return false.
        return false;
 
    }
 
    /**
     * Retrieve IDs of user's courses based on supplied criteria
     *
     * @param    array $args   see `get_enrollments`
     * @return   array
     * @since    3.0.0
     * @version  3.15.0
     */
    public function get_courses( $args = array() ) {
 
        return $this->get_enrollments( 'course', $args );
 
    }
 
    /**
     * Retrieve user's favorites based on supplied criteria.
     *
     * @since 7.5.0
     *
     * @param string $order_by Result set ordering field. Default "updated_date".
     * @param string $order    Result set order. Default "DESC". Accepts "DESC" or "ASC".
     * @param int    $limit    Number of favorites to return. Default is infinite.
     * @return bool|array
     */
    public function get_favorites( $order_by = 'updated_date', $order = 'DESC', $limit = -1 ) {
 
        global $wpdb;
 
        $limit_clause = $limit < 1 ? '' : "LIMIT 0, {$limit}";
 
        // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
        $res = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT * FROM {$wpdb->prefix}lifterlms_user_postmeta
                    WHERE meta_key = %s AND user_id = %d ORDER BY {$order_by} {$order} {$limit_clause};",
                '_favorite',
                get_current_user_id()
            )
        );
 
        return empty( $res ) ? false : $res;
 
    }
 
    /**
     * Retrieve IDs of courses a user has completed
     *
     * @param  array $args query arguments
     *                      @arg int    $limit    number of courses to return
     *                      @arg string $orderby  table reference and field to order results by
     *                      @arg string $order    result order (DESC, ASC)
     *                      @arg int    $skip     number of results to skip for pagination purposes
     * @return array        "courses" will contain an array of course ids
     *                      "more" will contain a boolean determining whether or not more courses are available beyond supplied limit/skip criteria
     * @since   ??
     * @version 3.24.0
     */
    public function get_completed_courses( $args = array() ) {
 
        global $wpdb;
 
        $args = array_merge(
            array(
                'limit'   => 20,
                'orderby' => 'upm.updated_date',
                'order'   => 'DESC',
                'skip'    => 0,
            ),
            $args
        );
 
        // Add one to the limit to see if there's pagination.
        $args['limit']++;
 
        // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
        $q = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT upm.post_id AS id
             FROM {$wpdb->prefix}lifterlms_user_postmeta AS upm
             JOIN {$wpdb->posts} AS p ON p.ID = upm.post_id
             WHERE p.post_type = 'course'
               AND upm.meta_key = '_is_complete'
               AND upm.meta_value = 'yes'
               AND upm.user_id = %d
             ORDER BY {$args['orderby']} {$args['order']}
             LIMIT %d, %d;
            ",
                array(
                    $this->get_id(),
                    $args['skip'],
                    $args['limit'],
                )
            ),
            'OBJECT_K'
        ); // db call ok; no-cache ok.
        // phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 
        $ids  = array_keys( $q );
        $more = false;
 
        // If we hit our limit we have too many results, pop the last one.
        if ( count( $ids ) === $args['limit'] ) {
            array_pop( $ids );
            $more = true;
        }
 
        // Reset args to pass back for pagination.
        $args['limit']--;
 
        $r = array(
            'limit'   => $args['limit'],
            'more'    => $more,
            'results' => $ids,
            'skip'    => $args['skip'],
        );
 
        return $r;
 
    }
 
    /**
     * Get the formatted date when a course or lesson was completed by the student
     *
     * @param    int    $object_id  WP Post ID of a course or lesson
     * @param    string $format     date format as accepted by php date()
     * @return   false|string            will return false if the user is not enrolled
     * @since    ??
     * @version  ??
     */
    public function get_completion_date( $object_id, $format = 'F d, Y' ) {
 
        global $wpdb;
 
        $q = $wpdb->get_var(
            $wpdb->prepare(
                "SELECT updated_date FROM {$wpdb->prefix}lifterlms_user_postmeta WHERE meta_key = '_is_complete' AND meta_value = 'yes' AND user_id = %d AND post_id = %d ORDER BY updated_date DESC LIMIT 1",
                array( $this->get_id(), $object_id )
            )
        ); // db call ok; no-cache ok.
 
        return ( $q ) ? date_i18n( $format, strtotime( $q ) ) : false;
 
    }
 
    /**
     * Retrieve IDs of user's enrollments by post type (and additional criteria)
     *
     * @param  string $post_type  name of the post type (course|membership)
     * @param  array  $args query arguments
     *                      @arg int    $limit    number of courses to return
     *                      @arg string $orderby  table reference and field to order results by
     *                      @arg string $order    result order (DESC, ASC)
     *                      @arg int    $skip     number of results to skip for pagination purposes
     *                      @arg string $status   filter results by enrollment status, "any", "enrolled", "cancelled", or "expired"
     * @return array        "results" will contain an array of course ids
     *                      "more" will contain a boolean determining whether or not more courses are available beyond supplied limit/skip criteria
     *                      "found" will contain the total possible FOUND_ROWS() for the query
     * @since    3.0.0
     * @version  3.15.1
     */
    public function get_enrollments( $post_type = 'course', $args = array() ) {
 
        global $wpdb;
 
        $args = wp_parse_args(
            $args,
            array(
                'limit'   => 20,
                'orderby' => 'upm.updated_date',
                'order'   => 'DESC',
                'skip'    => 0,
                'status'  => 'any', // Any, enrolled, cancelled, expired.
            )
        );
 
        // Prefix membership.
        if ( 'membership' === $post_type ) {
            $post_type = 'llms_membership';
        }
 
        // Sanitize order & orderby.
        $args['orderby'] = preg_replace( '/[^a-zA-Z_.]/', '', $args['orderby'] );
        $args['order']   = preg_replace( '/[^a-zA-Z_.]/', '', $args['order'] );
 
        // Allow "short" orderby's to be passed in without a table reference.
        switch ( $args['orderby'] ) {
            case 'date':
                $args['orderby'] = 'upm.updated_date';
                break;
            case 'order':
                $args['orderby'] = 'p.menu_order';
                break;
            case 'title':
                $args['orderby'] = 'p.post_title';
                break;
        }
 
        // Prepare additional status AND clauses.
        if ( 'any' !== $args['status'] ) {
            $status = $wpdb->prepare(
                "
                AND upm.meta_value = %s
                AND upm.updated_date = (
                    SELECT MAX( upm2.updated_date )
                      FROM {$wpdb->prefix}lifterlms_user_postmeta AS upm2
                     WHERE upm2.meta_key = '_status'
                       AND upm2.user_id = %d
                       AND upm2.post_id = upm.post_id
                    )",
                $args['status'],
                $this->get_id()
            );
        } else {
            $status = '';
        }
 
        // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
        $query = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT SQL_CALC_FOUND_ROWS DISTINCT upm.post_id AS id
             FROM {$wpdb->prefix}lifterlms_user_postmeta AS upm
             JOIN {$wpdb->posts} AS p ON p.ID = upm.post_id
             WHERE p.post_type = %s
               AND p.post_status = 'publish'
               AND upm.meta_key = '_status'
               AND upm.user_id = %d
               {$status}
             ORDER BY {$args['orderby']} {$args['order']}
             LIMIT %d, %d;
            ",
                array(
                    $post_type,
                    $this->get_id(),
                    $args['skip'],
                    $args['limit'],
                )
            ),
            'OBJECT_K'
        ); // db call ok; no-cache ok.
        // phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 
        $found = absint( $wpdb->get_var( 'SELECT FOUND_ROWS()' ) ); // db call ok; no-cache ok.
 
        return array(
            'found'   => $found,
            'limit'   => $args['limit'],
            'more'    => ( $found > ( ( $args['skip'] / $args['limit'] + 1 ) * $args['limit'] ) ),
            'skip'    => $args['skip'],
            'results' => array_keys( $query ),
        );
 
    }
 
    /**
     * Get the formatted date when a user initially enrolled in a product or when they were last updated
     *
     * @since 3.0.0
     * @since 3.35.0 Prepare SQL properly.
     *
     * @param   int    $product_id  WP Post ID of a course or membership
     * @param   string $date        "enrolled" will get the most recent start date, "updated" will get the most recent status change date
     * @param   string $format      date format as accepted by php date(), if none supplied uses the WP core "date_format" option
     * @return  false|string        will return false if the user is not enrolled
     */
    public function get_enrollment_date( $product_id, $date = 'enrolled', $format = null ) {
 
        if ( ! $format ) {
            $format = get_option( 'date_format', 'M d, Y' );
        }
 
        $cache_key = sprintf( 'date_%1$s_%2$s', $date, $product_id );
        $res       = $this->cache_get( $cache_key );
 
        if ( false === $res ) {
 
            $key = ( 'enrolled' === $date ) ? '_start_date' : '_status';
 
            global $wpdb;
 
            // Get the oldest recorded Enrollment date.
            $res = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT updated_date FROM {$wpdb->prefix}lifterlms_user_postmeta WHERE meta_key = %s AND user_id = %d AND post_id = %d ORDER BY updated_date DESC LIMIT 1",
                    array( $key, $this->get_id(), $product_id )
                )
            );
 
            $this->cache_set( $cache_key, $res );
 
        }
 
        return ( $res ) ? date_i18n( $format, strtotime( $res ) ) : false;
 
    }
 
    /**
     * Get the current enrollment status of a student for a particular product
     *
     * @since 3.0.0
     * @since 3.17.0 Unknown.
     * @since 3.37.9 Added filter `llms_user_enrollment_status_allowed_post_types`.
     * @since 4.4.1 Moved filter `llms_user_enrollment_status_allowed_post_types` to function `llms_get_enrollable_status_check_post_types()`.
     * @since 4.18.0 Added a tie-breaker when there are multiple enrollment statuses with the same date & time.
     * @since 5.7.0 Replaced the call to the deprecated `LLMS_Lesson::get_parent_course()` method with `LLMS_Lesson::get( 'parent_course' )`.
     *
     * @param  int  $product_id  WP Post ID of a Course, Section, Lesson, or Membership
     * @param  bool $use_cache   If true, returns cached data if available, if false will run a db query
     * @return false|string      When no enrollment status exists, returns `false`. Otherwise returns the
     *                           enrollment status as a string.
     */
    public function get_enrollment_status( $product_id, $use_cache = true ) {
 
        $status       = false;
        $product_type = get_post_type( $product_id );
 
        if ( ! in_array( $product_type, llms_get_enrollable_status_check_post_types(), true ) ) {
            /* This filter is documented at the end of this method. */
            return apply_filters( 'llms_get_enrollment_status', $status, $this->get_id(), $product_id, $use_cache );
        }
 
        // Get course ID if we're looking at a lesson or section.
        if ( in_array( $product_type, array( 'section', 'lesson' ), true ) ) {
 
            $llms_post = llms_get_post( $product_id );
            if ( $llms_post ) {
                $product_id = $llms_post->get( 'parent_course' );
            }
        }
 
        if ( $use_cache ) {
            $status = $this->cache_get( sprintf( 'enrollment_status_%d', $product_id ) );
        }
 
        /**
         * After checking the cache, $status will be:
         *     + `false` if there was nothing in the cache or the function was instructed to not use the cache: Query the database to get the status.
         *     + a string if there was a status: No need to query the database.
         *     + `null` if there's no status: No need to query the database.
         */
        if ( false === $status ) {
 
            global $wpdb;
 
            // Get the most recent recorded status.
            $status = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT meta_value FROM {$wpdb->prefix}lifterlms_user_postmeta
                     WHERE meta_key = '_status' AND user_id = %d AND post_id = %d
                     ORDER BY updated_date DESC, meta_id DESC LIMIT 1;",
                    array( $this->get_id(), $product_id )
                )
            );
 
            // Cache the data: `null` will be stored if the student has no status.
            $this->cache_set( sprintf( 'enrollment_status_%d', $product_id ), $status );
 
        }
 
        // Don't return `null` values from the database.
        $status = $status ? $status : false;
 
        /**
         * Filter a user's enrollment status for a specific post.
         *
         * Note that if a value is modified by this filter the modified value is *not* cached. Therefore you should
         * consider implementing caching of your modified value which matches the caching implemented by this method
         * so that the modified value obeys the default caching behavior.
         *
         * @since Unknown
         *
         * @param false|string $status     When no enrollment status exists, returns `false`. Otherwise returns the
         *                                     enrollment status as a string.
         * @param int          $user_id    WP_User ID of the student
         * @param int          $product_id WP_Post ID of the post used to check the enrollment status.
         * @param boolean      $use_cache  Whether or not to use the local cache.
         */
        return apply_filters( 'llms_get_enrollment_status', $status, $this->get_id(), $product_id, $use_cache );
 
    }
 
    /**
     * Get the enrollment trigger for a the student's enrollment in a course
     *
     * @param    int $product_id   WP Post ID of the course or membership
     * @return   string|false
     * @since    ??
     * @version  3.21.0
     */
    public function get_enrollment_trigger( $product_id ) {
 
        $trigger = llms_get_user_postmeta( $this->get_id(), $product_id, '_enrollment_trigger', true );
        return $trigger ? $trigger : false;
 
    }
 
    /**
     * Get the enrollment trigger id for a the student's enrollment in a course
     *
     * @param    int $product_id  WP Post ID of the course or membership
     * @return   int|false
     * @since    3.0.0
     * @version  3.17.2
     */
    public function get_enrollment_trigger_id( $product_id ) {
 
        $trigger = $this->get_enrollment_trigger( $product_id );
        $id      = false;
        if ( $trigger && false !== strpos( $trigger, 'order_' ) ) {
            $trigger_obj = $this->get_enrollment_order( $product_id );
            if ( $trigger_obj instanceof LLMS_Order ) {
                $id = $trigger_obj->get( 'id' );
            } elseif ( $trigger_obj instanceof WP_Post ) {
                $id = $trigger_obj->ID;
            }
        } elseif ( $trigger && false !== strpos( $trigger, 'admin_' ) ) {
            $id = absint( str_replace( 'admin_', '', $trigger ) );
        }
        return $id;
 
    }
 
    /**
     * Retrieve postmeta events related to the student
     *
     * @param    array $args  default args, see LLMS_Query_User_Postmeta
     * @return   array
     * @since    3.15.0
     * @version  3.15.0
     */
    public function get_events( $args = array() ) {
 
        $query = new LLMS_Query_User_Postmeta(
            wp_parse_args(
                $args,
                array(
                    'types'    => 'all',
                    'per_page' => 10,
                    'user_id'  => $this->get_id(),
                )
            )
        );
 
        return $query->get_metas();
 
    }
 
    /**
     * Get the students grade for a lesson / course
     * All grades are based on quizzes assigned to lessons
     *
     * @param    int  $object_id  WP Post ID of a course or lesson
     * @param    bool $use_cache  If true, uses cached results
     * @return   mixed
     * @since    ??
     * @version  3.24.0
     */
    public function get_grade( $object_id, $use_cache = true ) {
        $grade = llms()->grades()->get_grade( $object_id, $this, $use_cache );
        if ( is_null( $grade ) ) {
            $grade = _x( 'N/A', 'Grade to display when no quizzes taken or available', 'lifterlms' );
        }
        return apply_filters( 'llms_student_get_grade', $grade, $this, $object_id, get_post_type( $object_id ) );
    }
 
    /**
     * Retrieve IDs of user's memberships based on supplied criteria
     *
     * @param    array $args   see `get_enrollments`
     * @return   array
     * @since    3.15.0
     * @version  3.15.0
     */
    public function get_memberships( $args = array() ) {
 
        return $this->get_enrollments( 'membership', $args );
 
    }
 
    /**
     * Retrieve a user's notification subscription preferences for a given type & trigger
     *
     * @param    string $type     notification type: email, basic, etc...
     * @param    string $trigger  notification trigger: eg purchase_receipt, lesson_complete, etc...
     * @param    string $default  value to return if no setting is saved in the db
     * @return   string             yes or no
     * @since    3.10.0
     * @version  3.10.0
     */
    public function get_notification_subscription( $type, $trigger, $default = 'no' ) {
 
        $prefs = $this->get( 'notification_subscriptions' );
        if ( ! $prefs ) {
            $prefs = array();
        }
 
        if ( isset( $prefs[ $type ] ) && isset( $prefs[ $type ][ $trigger ] ) ) {
            return $prefs[ $type ][ $trigger ];
        }
 
        return $default;
 
    }
 
    /**
     * Retrieve the student's overall grade
     *
     * Grade = sum of grades for all courses divided by number of enrolled courses
     * if a course has no quizzes in it, it cannot be graded and is therefore excluded from the calculation.
     *
     * Cached data is automatically cleared when a student completes a quiz.
     *
     * @since 3.2.0
     *
     * @param boolean $use_cache If `false`, calculates the grade, otherwise utilizes cached data (if available)
     * @return float|string Grade as float or "N/A"
     */
    public function get_overall_grade( $use_cache = true ) {
 
        $grade = null;
 
        // Attempt to pull from the cache first.
        if ( $use_cache ) {
 
            $grade = $this->get( $this->meta_prefix . 'overall_grade' );
 
            if ( is_numeric( $grade ) ) {
                $grade = floatval( $grade );
            }
        }
 
        // Cache disabled or no cached data available.
        if ( ! $use_cache || null === $grade || '' === $grade ) {
 
            $grades = array();
 
            // Get courses.
            $courses = $this->get_courses(
                array(
                    'limit' => 9999,
                )
            );
 
            // Loop through courses.
            foreach ( $courses['results'] as $course_id ) {
 
                // Get course grade.
                $g = $this->get_grade( $course_id );
 
                // If an actual grade (not N/A) is returned.
                if ( is_numeric( $g ) ) {
                    array_push( $grades, $g );
                }
            }
 
            // If we have at least one grade.
            $count = count( $grades );
            if ( $count ) {
 
                $grade = round( array_sum( $grades ) / $count, 2 );
 
            } else {
 
                $grade = _x( 'N/A', 'overall grade when no quizzes', 'lifterlms' );
 
            }
 
            // Cache the grade.
            $this->set( 'overall_grade', $grade );
 
        }
 
        return apply_filters( 'llms_student_get_overall_grade', $grade, $this );
 
    }
 
    /**
     * Retrieve a student's overall progress
     * Overall progress is the total percentage completed based on all courses the student is enrolled in
     * Cached data is cleared every time the student completes a lesson
     *
     * @param    boolean $use_cache  if false, calculates the progress, otherwise utilizes cached data (if available)
     * @return   float
     * @since    3.2.0
     * @version  3.2.0
     */
    public function get_overall_progress( $use_cache = true ) {
 
        $progress = null;
 
        // Attempt to pull from the cache first.
        if ( $use_cache ) {
 
            $progress = $this->get( $this->meta_prefix . 'overall_progress' );
 
            if ( is_numeric( $progress ) ) {
                $progress = floatval( $progress );
            }
        }
 
        // Cache disabled or no cached data available.
        if ( ! $use_cache || null === $progress || '' === $progress ) {
 
            $progresses = array();
 
            // Get courses.
            $courses = $this->get_courses(
                array(
                    'limit' => 9999,
                )
            );
 
            // Loop through courses.
            foreach ( $courses['results'] as $course_id ) {
                array_push( $progresses, $this->get_progress( $course_id, 'course' ) );
            }
 
            $count = count( $progresses );
            if ( $count ) {
 
                $progress = round( array_sum( $progresses ) / $count, 2 );
 
            } else {
 
                $progress = 0;
 
            }
 
            // Cache the grade.
            $this->set( 'overall_progress', $progress );
 
        }
 
        return apply_filters( 'llms_student_get_overall_progress', $progress, $this );
 
    }
 
    /**
     * Get the students last completed lesson in a course
     *
     * @param    int $course_id    WP_Post ID of the course
     * @return   int                   WP_Post ID of the lesson or false if no progress has been made
     * @since    3.0.0
     * @version  3.0.0
     */
    public function get_last_completed_lesson( $course_id ) {
 
        $course  = new LLMS_Course( $course_id );
        $lessons = array_reverse( $course->get_lessons( 'ids' ) );
 
        foreach ( $lessons as $lesson ) {
            if ( $this->is_complete( $lesson, 'lesson' ) ) {
                return $lesson;
            }
        }
 
        return false;
 
    }
 
    /**
     * Retrieve an array of Membership Levels for a user
     *
     * @return array
     * @since   2.2.3
     * @version 2.2.3
     */
    public function get_membership_levels() {
 
        $levels = get_user_meta( $this->get_id(), '_llms_restricted_levels', true );
 
        if ( empty( $levels ) ) {
 
            $levels = array();
 
        }
 
        return $levels;
 
    }
 
    /**
     * Get the full name of a student
     *
     * @return   string
     * @since    3.0.4
     * @version  3.5.1
     */
    public function get_name() {
 
        $name = trim( $this->get( 'first_name' ) . ' ' . $this->get( 'last_name' ) );
 
        if ( ! $name ) {
            $name = $this->display_name;
        }
 
        return apply_filters( 'llms_student_get_name', $name, $this->get_id(), $this );
 
    }
 
    /**
     * Get the next lesson a student needs to complete in a course
     *
     * @param    int $course_id    WP_Post ID of the course
     * @return   int                   WP_Post ID of the lesson or false if all courses are complete
     * @since    3.0.1
     * @version  3.0.1
     */
    public function get_next_lesson( $course_id ) {
 
        $course  = new LLMS_Course( $course_id );
        $lessons = $course->get_lessons( 'ids' );
 
        foreach ( $lessons as $lesson ) {
            if ( ! $this->is_complete( $lesson, 'lesson' ) ) {
                return $lesson;
            }
        }
 
        return false;
 
    }
 
    public function get_orders( $params = array() ) {
 
        $params = wp_parse_args(
            $params,
            array(
 
                'count'    => 25,
                'page'     => 1,
                'statuses' => array_keys( llms_get_order_statuses() ),
 
            )
        );
 
        extract( $params );
 
        $q = new WP_Query(
            array(
                'order'          => 'DESC',
                'orderby'        => 'date',
                'meta_query'     => array(
                    array(
                        'key'   => '_llms_user_id',
                        'value' => $this->get_id(),
                    ),
                ),
                'paged'          => $page,
                'posts_per_page' => $count,
                'post_status'    => $statuses,
                'post_type'      => 'llms_order',
            )
        );
 
        $orders = array();
 
        if ( $q->have_posts() ) {
 
            foreach ( $q->posts as $post ) {
 
                $orders[ $post->ID ] = new LLMS_Order( $post );
 
            }
        }
 
        return array(
            'count'  => count( $q->posts ),
            'page'   => $page,
            'pages'  => $q->max_num_pages,
            'orders' => $orders,
        );
 
    }
 
    /**
     * Get students progress through a course or track
     *
     * @param    int     $object_id  course or track id
     * @param    string  $type       object type [course|course_track|section]
     * @param    boolean $use_cache  if true, will use cached data from the usermeta table (if available)
     *                               if false, will bypass cached data and recalculate the progress from scratch
     * @return   float
     * @since    3.0.0
     * @version  3.24.0
     */
    public function get_progress( $object_id, $type = 'course', $use_cache = true ) {
 
        $ret       = 0;
        $cache_key = sprintf( '%1$s_%2$d_progress', $type, $object_id );
        $cached    = $use_cache ? $this->get( $cache_key ) : '';
 
        if ( '' === $cached ) {
 
            $total     = 0;
            $completed = 0;
 
            if ( 'course' === $type ) {
 
                $course  = new LLMS_Course( $object_id );
                $lessons = $course->get_lessons( 'ids' );
                $total   = count( $lessons );
                foreach ( $lessons as $lesson ) {
                    if ( $this->is_complete( $lesson, 'lesson' ) ) {
                        $completed++;
                    }
                }
            } elseif ( 'course_track' === $type ) {
 
                $track   = new LLMS_Track( $object_id );
                $courses = $track->get_courses();
                $total   = count( $courses );
                foreach ( $courses as $course ) {
                    if ( $this->is_complete( $course->ID, 'course' ) ) {
                        $completed++;
                    }
                }
            } elseif ( 'section' === $type ) {
 
                $section = new LLMS_Section( $object_id );
                $lessons = $section->get_lessons( 'ids' );
                $total   = count( $lessons );
                foreach ( $lessons as $lesson ) {
                    if ( $this->is_complete( $lesson, 'lesson' ) ) {
                        $completed++;
                    }
                }
            }
 
            $ret = ( ! $completed || ! $total ) ? 0 : round( 100 / ( $total / $completed ), 2 );
            $this->set( $cache_key, $ret );
 
        } else {
            $ret = $cached;
        }// End if().
 
        /**
         * @filter llms_student_get_progress
         * Filters the return of get_progress method
         * @param    float   $ret        student's progress
         * @param    int     $object_id  WP_Post ID of the object
         * @param    string  $type       object post type [course|course_track|section]
         * @param    int     $user_id    WP_User ID of the student
         * @since    unknown
         * @version  3.24.0
         */
        return apply_filters( 'llms_student_get_progress', $ret, $object_id, $type, $this->get_id() );
 
    }
 
    /**
     * Retrieve the student's original registration date in the chosen format.
     *
     * @since Unknown
     * @since 5.2.0 Changed the date to be relative to the local time zone.
     *
     * @param string $format Any date format that can be passed to date().
     * @return string
     */
    public function get_registration_date( $format = '' ) {
 
        if ( ! $format ) {
            $format = get_option( 'date_format' );
        }
 
        return wp_date( $format, strtotime( $this->get( 'user_registered' ) ) );
 
    }
 
    /**
     * Determine if the student is active in at least one course or membership
     *
     * @since 3.14.0
     *
     * @return bool
     */
    public function is_active() {
 
        // Check memberships first, it's a faster query.
        if ( $this->get_membership_levels() ) {
            return true;
        }
 
        // Check for at least one enrolled course.
        $courses = $this->get_courses(
            array(
                'limit'  => 1,
                'status' => 'enrolled',
            )
        );
 
        if ( $courses['results'] ) {
            return true;
        }
 
        // Not active.
        return false;
 
    }
 
    /**
     * Determine if the student has completed a course, track, or lesson
     *
     * @param    int    $object_id  WP Post ID of a course or lesson or section or the term id of the track
     * @param    string $type    Object type (course, lesson, section, or track)
     * @return   boolean
     * @since    3.0.0
     * @version  3.24.0
     */
    public function is_complete( $object_id, $type = 'course' ) {
 
        // check tracks by progress
        // this is done because tracks can have the same id as another object...
        // @todo tracks should have a different table or format since the post_id col won't guarantee uniqueness...
        if ( 'course_track' === $type ) {
 
            $ret = ( 100 == $this->get_progress( $object_id, $type ) );
 
            // Everything else can be checked on the postmeta table.
        } else {
 
            $query = new LLMS_Query_User_Postmeta(
                array(
                    'types'                 => 'completion',
                    'include_post_children' => false,
                    'user_id'               => $this->get_id(),
                    'post_id'               => $object_id,
                    'per_page'              => 1,
                )
            );
 
            $ret = $query->has_results();
 
        }
 
        return apply_filters( 'llms_is_' . $type . '_complete', $ret, $object_id, $type, $this );
 
    }
 
    /**
     * Determine if the student is a LifterLMS Instructor (of any kind)
     *
     * Can be admin, manager, instructor, assistant.
     *
     * @return   boolean
     * @since    3.14.0
     * @version  3.14.0
     */
    public function is_instructor() {
        return $this->user->has_cap( 'lifterlms_instructor' );
    }
 
    /**
     * Add student postmeta data for completion of a lesson, section, course or track
     *
     * @param  int    $object_id    WP Post ID of the lesson, section, course or track
     * @param  string $trigger      String describing the reason for mark completion
     * @return bool
     * @since    3.3.1
     * @version  3.21.0
     */
    private function insert_completion_postmeta( $object_id, $trigger = 'unspecified' ) {
 
        // Add info to the user postmeta table.
        $user_metadatas = array(
            '_is_complete'        => 'yes',
            '_completion_trigger' => $trigger,
        );
 
        $update = llms_bulk_update_user_postmeta( $this->get_id(), $object_id, $user_metadatas, false );
 
        // Returns an array with errored keys or true on success.
        return is_array( $update ) ? false : true;
 
    }
 
    /**
     * Add student postmeta data for incompletion of a lesson, section, course or track
     * An "_is_complete" value of "no" is inserted into postmeta
     *
     * @param    int    $object_id    WP Post ID of the lesson, section, course or track
     * @param    string $trigger      String describing the reason for mark incompletion
     * @return   boolean
     * @since    3.5.0
     * @version  3.24.0
     */
    private function insert_incompletion_postmeta( $object_id, $trigger = 'unspecified' ) {
 
        global $wpdb;
 
        // Add '_is_complete' to the user postmeta table for object.
        $user_metadatas = array(
            '_is_complete'        => 'no',
            '_completion_trigger' => $trigger,
        );
 
        foreach ( $user_metadatas as $key => $value ) {
 
            /**
             * It's too difficult to keep track of multiple postmetas for each lesson incomplete
             * Instead, I'm just replacing the old '_is_complete' value with 'no'
             *
             * Lessons that have never been complete will not have an '_is_complete' record,
             * Lessons that were completed will have an '_is_complete' record of 'yes',
             * Lessons that have been completed once but were marked incomplete will have an '_is_complete' record of 'no'
             */
            $update = $wpdb->update(
                $wpdb->prefix . 'lifterlms_user_postmeta',
                array(
                    'user_id'      => $this->get_id(),
                    'post_id'      => $object_id,
                    'meta_key'     => $key,
                    'meta_value'   => $value,
                    'updated_date' => current_time( 'mysql' ),
                ),
                array(
                    'user_id'  => $this->get_id(),
                    'post_id'  => $object_id,
                    'meta_key' => $key,
                ),
                array( '%d', '%d', '%s', '%s', '%s' )
            ); // db call ok; no-cache ok.
 
            if ( false === $update ) {
 
                return false;
 
            }
        }
 
        return true;
 
    }
 
    /**
     * Add student postmeta data when lesson is favorited.
     *
     * @since 7.5.0
     *
     * @see LLMS_Student->mark_favorite()
     *
     * @param int $object_id WP Post ID of the object to mark/unmark as favorite.
     * @return bool
     */
    private function insert_favorite_postmeta( $object_id ) {
 
        $update = llms_update_user_postmeta( $this->get_id(), $object_id, '_favorite', true );
 
        // Returns boolean if postmeta update is successful.
        return is_array( $update ) ? false : true;
 
    }
 
    /**
     * Remove student postmeta data when lesson is unfavorited.
     *
     * @since 7.5.0
     *
     * @param int $object_id WP Post ID of the object to mark/unmark as favorite.
     * @return bool
     */
    private function remove_favorite_postmeta( $object_id ) {
 
        $update = llms_delete_user_postmeta( $this->get_id(), $object_id, '_favorite', true );
 
        // Returns boolean if postmeta update is successful.
        return is_array( $update ) ? false : true;
 
    }
 
    /**
     * Add student postmeta data for enrollment into a course or membership
     *
     * @param    int    $product_id   WP Post ID of the course or membership
     * @param    string $trigger      String describing the reason for enrollment
     * @return   boolean
     * @since    2.2.3
     * @version  3.21.0
     */
    private function insert_enrollment_postmeta( $product_id, $trigger = 'unspecified' ) {
 
        // Add info to the user postmeta table.
        $user_metadatas = array(
            '_enrollment_trigger' => $trigger,
            '_start_date'         => 'yes',
            '_status'             => 'enrolled',
        );
 
        $update = llms_bulk_update_user_postmeta( $this->get_id(), $product_id, $user_metadatas, false );
 
        // Returns an array with errored keys or true on success.
        return is_array( $update ) ? false : true;
 
    }
 
    /**
     * Remove student enrollment postmeta for a given product.
     *
     * @since 3.33.0
     *
     * @param int    $product_id WP Post ID of the course or membership.
     * @param string $trigger    Optional. String the reason for enrollment. Default `null`
     * @return bool Whether or not the enrollment records have been succesfully removed.
     */
    private function delete_enrollment_postmeta( $product_id, $trigger = null ) {
 
        // Delete info from the user postmeta table.
        $user_metadatas = array(
            '_enrollment_trigger' => $trigger,
            '_start_date'         => null,
            '_status'             => null,
        );
 
        $delete = llms_bulk_delete_user_postmeta( $this->get_id(), $product_id, $user_metadatas );
 
        return is_array( $delete ) ? false : true;
    }
 
    /**
     * Add a new status record to the user postmeta table for a specific product
     *
     * @param    int    $product_id   WP Post ID of the course or membership
     * @param    string $status       string describing the new status
     * @param    string $trigger  String describing the reason for enrollment (optional)
     * @return   boolean
     * @since    3.0.0
     * @version  3.21.0
     */
    private function insert_status_postmeta( $product_id, $status = '', $trigger = null ) {
 
        $update = llms_update_user_postmeta( $this->get_id(), $product_id, '_status', $status, false );
 
        if ( $update && $trigger ) {
            $update = llms_update_user_postmeta( $this->get_id(), $product_id, '_enrollment_trigger', $trigger, false );
        }
 
        return $update;
 
    }
 
    /**
     * Determine if a student is enrolled in a Course or Membership.
     *
     * @see     llms_is_user_enrolled()
     *
     * @param   int|array $product_ids WP Post ID of a Course, Section, Lesson, or Membership or array of multiple IDs.
     * @param   string    $relation    Comparator for enrollment check.
     *                                     All = user must be enrolled in all $product_ids.
     *                                     Any = user must be enrolled in at least one of the $product_ids.
     * @param   bool      $use_cache  If true, returns cached data if available, if false will run a db query.
     *
     * @return  boolean
     *
     * @since   3.0.0
     * @version 3.25.0
     */
    public function is_enrolled( $product_ids = null, $relation = 'all', $use_cache = true ) {
 
        // Assume enrollment unless we find otherwise.
        $ret = true;
 
        // Allow a single product ID to be submitted (backwards compat).
        $product_ids = ! is_array( $product_ids ) ? array( $product_ids ) : $product_ids;
 
        foreach ( $product_ids as $id ) {
 
            $enrolled = ( 'enrolled' === strtolower( $this->get_enrollment_status( $id, $use_cache ) ) );
 
            // If use must be enrolled in all products and one is not enrolled: quit the loop & return false.
            if ( 'all' === $relation && ! $enrolled ) {
                $ret = false;
                break;
 
                // If user must be enrolled in any.
            } elseif ( 'any' === $relation ) {
 
                // If we find an enrollment: return true and quit the loop.
                if ( $enrolled ) {
                    $ret = true;
                    break;
 
                    // If not switch return to false but keep looking.
                } else {
                    $ret = false;
                }
            }
        }
 
        return apply_filters( 'llms_is_user_enrolled', $ret, $this, $product_ids, $relation, $use_cache );
 
    }
 
    /**
     * Mark a lesson, section, course, or track complete for the given user.
     *
     * @param  int    $object_id    WP Post ID of the lesson, section, course, or track
     * @param  string $object_type  object type [lesson|section|course|track]
     * @param  string $trigger      String describing the reason for marking complete
     * @return bool
     *
     * @see    llms_mark_complete() calls this function without having to instantiate the LLMS_Student class first
     *
     * @since    3.3.1
     * @version  3.17.1
     */
    public function mark_complete( $object_id, $object_type, $trigger = 'unspecified' ) {
 
        // Short circuit if it's already completed.
        if ( $this->is_complete( $object_id, $object_type ) ) {
            return true;
        }
 
        return $this->update_completion_status( 'complete', $object_id, $object_type, $trigger );
 
    }
 
    /**
     * Mark a lesson, section, course, or track incomplete for the given user
     * Gives an "_is_complete" value of "no" for the given object
     *
     * @param  int    $object_id    WP Post ID of the lesson, section, course, or track
     * @param  string $object_type  object type [lesson|section|course|track]
     * @param  string $trigger      String describing the reason for marking incomplete
     * @return bool
     *
     * @see    llms_mark_incomplete() calls this function without having to instantiate the LLMS_Student class first
     *
     * @since    3.5.0
     * @version  3.17.0
     */
    public function mark_incomplete( $object_id, $object_type, $trigger = 'unspecified' ) {
 
        return $this->update_completion_status( 'incomplete', $object_id, $object_type, $trigger );
 
    }
 
    /**
     * Remove a student from a membership level.
     *
     * @since 2.7
     * @since 3.7.5 Unknown.
     * @since 3.36.2 Added the $delete parameter, that will allow related courses enrollments data deletion.
     *
     * @param  int     $membership_id WP Post ID of the membership.
     * @param  string  $status        Optional. Status to update the removal to. Default is `expired`.
     * @param  boolean $delete        Optional. Status to update the removal to. Default is `false`.
     * @return void
     */
    private function remove_membership_level( $membership_id, $status = 'expired', $delete = false ) {
 
        // Remove the user from the membership level.
        $membership_levels = $this->get_membership_levels();
        $key               = array_search( $membership_id, $membership_levels );
        if ( false !== $key ) {
            unset( $membership_levels[ $key ] );
        }
        update_user_meta( $this->get_id(), '_llms_restricted_levels', $membership_levels );
 
        global $wpdb;
        // Locate all enrollments triggered by this membership level.
        $q = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT post_id FROM {$wpdb->prefix}lifterlms_user_postmeta WHERE user_id = %d AND meta_key = '_enrollment_trigger' AND meta_value = %s",
                array( $this->get_id(), 'membership_' . $membership_id )
            ),
            'OBJECT_K'
        ); // db call ok; no-cache ok.
 
        $courses = array_keys( $q );
 
        if ( $courses ) {
 
            // Loop through all the courses and update the enrollment status.
            foreach ( $courses  as $course_id ) {
                if ( ! $delete ) {
                    $this->unenroll( $course_id, 'membership_' . $membership_id, $status );
                } else {
                    $this->delete_enrollment( $course_id, 'membership_' . $membership_id );
                }
            }
        }
 
    }
 
    /**
     * Remove a student from a LifterLMS course or membership
     *
     * @since 3.0.0
     * @since 3.26.0 Unknown.
     * @since 3.37.9 Update to accommodate custom post type enrollments added through new filters.
     *               Marked action `llms_user_removed_from_membership_level` as deprecated, use `llms_user_removed_from_membership` instead.
     * @since 6.0.0 Removed the deprecated `llms_user_removed_from_membership_level` action hook
     *              and moved the call to `LLMS_Student::remove_membership_level()` to be before triggering the
     *              `llms_user_removed_from_{$post_type}` action hook.
     *
     * @see llms_unenroll_student()
     *
     * @param  int    $product_id WordPress Post ID of the course or membership.
     * @param  string $trigger    Only remove the student if the original enrollment trigger matches the submitted value.
     *                            Passing `any` will remove regardless of enrollment trigger.
     * @param  string $new_status the value to update the new status with after removal is complete.
     * @return bool
     */
    public function unenroll( $product_id, $trigger = 'any', $new_status = 'expired' ) {
 
        // Can only unenroll those that are a currently enrolled.
        if ( ! $this->is_enrolled( $product_id, 'all', false ) ) {
            return false;
        }
 
        // Assume we can't unenroll.
        $update = false;
 
        // If trigger is "any" we'll unenroll regardless of the trigger.
        if ( 'any' === $trigger ) {
 
            $update = true;
 
        } else {
 
            $enrollment_trigger = $this->get_enrollment_trigger( $product_id );
 
            // No enrollment trigger exists b/c pre 3.0.0 enrollment, unenroll the user as if it was an 'any' trigger.
            if ( ! $enrollment_trigger ) {
 
                /**
                 * This filter allows customization of enrollments created prior to version 3.0.0
                 *
                 * Prior to 3.0.0 enrollments did not track an enrollment trigger so any unenrollments
                 * performed on an enrollment in this state will automatically be unenrolled.
                 *
                 * Returning `false` will prevent unenrollments against enrollments which don't have
                 * an enrollment trigger.
                 *
                 * @since 3.0.0
                 *
                 * @param bool $allow_unenrollment If true, allows unenrollment, otherwise prevents unenrollment.
                 */
                $update = apply_filters( 'lifterlms_legacy_unenrollment_action', true );
 
            } elseif ( $enrollment_trigger === $trigger ) {
 
                $update = true;
 
            }
        }
 
        // Update if we can.
        if ( $update ) {
 
            // Update enrollment for the product.
            if ( $this->insert_status_postmeta( $product_id, $new_status ) ) {
 
                // Update the cache.
                $this->cache_set( sprintf( 'enrollment_status_%d', $product_id ), $new_status );
                $this->cache_delete( sprintf( 'date_enrolled_%d', $product_id ) );
                $this->cache_delete( sprintf( 'date_updated_%d', $product_id ) );
 
                $post_type = str_replace( 'llms_', '', get_post_type( $product_id ) );
 
                // Run legacy action and trigger cascading unenrollments for membership relationships.
                if ( 'membership' === $post_type ) {
 
                    // Users should be unenrolled from all courses they accessed through this membership.
                    $this->remove_membership_level( $product_id, $new_status );
                }
 
                /**
                 * Trigger an action immediately following user unenrollment
                 *
                 * The dynamic portion of this hook, `{$post_type}` corresponds to the post type of the
                 * `$product_id`. Note that any post type prefixed with `llms_` is stripped. For example
                 * when triggered by a membership (`llms_membership`) the hook will be `llms_user_removed_from_membership`.
                 *
                 * @since 3.37.9
                 *
                 * @param int    $user_id    WP_User ID of the student
                 * @param int    $product_id WP_Post ID of the product.
                 * @param string $trigger    Enrollment trigger.
                 * @param string $new_status New enrollment status of the student after the unenrollment has taken place.
                 */
                do_action( "llms_user_removed_from_{$post_type}", $this->get_id(), $product_id, $trigger, $new_status );
 
                return true;
 
            }
        }
 
        // Update was prevented.
        return false;
 
    }
 
    /**
     * Delete a student enrollment.
     *
     * @since 3.33.0
     * @since 3.36.2 Added logic to physically remove from the membership level and remove enrollments data on related products.
     * @since 4.2.0 The `$enrollment_trigger` parameter was added to the `llms_user_enrollment_deleted` action hook.
     *
     * @see `llms_delete_student_enrollment()` calls this function without having to instantiate the LLMS_Student class first.
     *
     * @param int    $product_id WP Post ID of the course or membership.
     * @param string $trigger    Optional. Only delete the student's enrollment if the original enrollment trigger matches the submitted value.
     *                           "any" will remove regardless of enrollment trigger. Default "any".
     * @return bool Whether or not the enrollment records have been successfully removed.
     */
    public function delete_enrollment( $product_id, $trigger = 'any' ) {
 
        // Assume we can't delete the enrollment.
        $delete = false;
 
        // Get the stored trigger.
        $enrollment_trigger = $this->get_enrollment_trigger( $product_id );
 
        // Okay to delete if trigger is "any" or if it matches the stored enrollment trigger.
        if ( 'any' === $trigger || $enrollment_trigger === $trigger ) {
 
            $delete = true;
 
        } elseif ( ! $enrollment_trigger ) {
 
            /**
             * Customize the behavior of enrollment deletion for "legacy" orders.
             *
             * These orders were created before version 3.0.0 when there was no stored
             * enrollment trigger.
             *
             * By default, we'll automatically delete these enrollments regardless of trigger.
             *
             * @since 3.33.0
             *
             * @param boolean $delete Whether or not to delete the enrollment.
             */
            $delete = apply_filters( 'lifterlms_legacy_delete_enrollment_action', true );
 
            // Ensure we have an `$enrollment_trigger` when firing the `llms_user_enrollment_deleted` hook.
            $enrollment_trigger = $trigger;
 
        }
 
        // Delete the enrollment.
        if ( $delete && $this->delete_enrollment_postmeta( $product_id ) ) {
 
            // Clean the cache.
            $this->cache_delete( sprintf( 'enrollment_status_%d', $product_id ) );
            $this->cache_delete( sprintf( 'date_enrolled_%d', $product_id ) );
            $this->cache_delete( sprintf( 'date_updated_%d', $product_id ) );
 
            if ( 'llms_membership' === get_post_type( $product_id ) ) {
                // Physically remove from the membership level & remove enrollments data on related products.
                $this->remove_membership_level( $product_id, '', true );
            }
 
            /**
             * Fires after an user enrollment has been deleted.
             *
             * @since 3.33.0
             * @since 4.2.0 The `$enrollment_trigger` parameter was added.
             *
             * @param int    $user_id            WP User ID.
             * @param int    $product_id         WP Post ID of the course or membership.
             * @param string $enrollment_trigger The enrollment trigger.
             */
            do_action( 'llms_user_enrollment_deleted', $this->get_id(), $product_id, $enrollment_trigger );
 
            // Success.
            return true;
 
        }
 
        // Nothing was deleted.
        return false;
 
    }
 
    /**
     * Update the completion status of a track, course, section, or lesson for the current student
     *
     * Cascades up to parents and clears progress caches for parents.
     *
     * Triggers actions for completion/incompletion.
     *
     * Inserts / updates necessary user postmeta data.
     *
     * @since 3.17.0
     * @since 4.2.0 Use filterable functions to determine if the object is completable.
     *              Added filter to allow customization of object parent data.
     *
     * @param string $status      New status to update to, either "complete" or "incomplete".
     * @param int    $object_id   WP_Post ID of the object.
     * @param string $object_type The type of object. A lesson, section, course, or course_track.
     * @param string $trigger     String describing the reason for the status change.
     * @return bool
     */
    private function update_completion_status( $status, $object_id, $object_type, $trigger = 'unspecified' ) {
 
        $student_id = $this->get_id();
 
        /**
         * Fires before a student's object completion status is updated.
         *
         * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
         * either "complete" or "incomplete"
         *
         * @since Unknown
         *
         * @param int    $student_id  WP_User ID of the student.
         * @param int    $object_id   WP_Post ID of the object.
         * @param string $object_type The type of object. A lesson, section, course, or course_track.
         * @param string $trigger     String describing the reason for the status change.
         */
        do_action( "before_llms_mark_{$status}", $student_id, $object_id, $object_type, $trigger );
 
        // Retrieve an instance of the objec we're acting on.
        if ( in_array( $object_type, llms_get_completable_post_types(), true ) ) {
            $object = llms_get_post( $object_id );
        } elseif ( in_array( $object_type, llms_get_completable_taxonomies(), true ) ) {
            $object = get_term( $object_id, $object_type );
        } else {
            return false;
        }
 
        /**
         * Lessons have binary completion (complete or incomplete).
         *
         * Other objects are dependent on their children's statuses. These other object types
         * must check the combined progress of their children to see if it's complete / incomplete.
         */
        $complete = ( 'lesson' === $object_type ) ? ( 'complete' === $status ) : ( 100 == $this->get_progress( $object_id, $object_type, false ) );
 
        // Get parent information.
        $parent_data = array(
            'ids'  => array(),
            'type' => false,
        );
 
        // Get the immediate parent so we can cascade up and maybe update the parent's status.
        switch ( $object_type ) {
 
            case 'lesson':
                $parent_data['ids']  = array( $object->get( 'parent_section' ) );
                $parent_data['type'] = 'section';
                break;
 
            case 'section':
                $parent_data['ids']  = array( $object->get( 'parent_course' ) );
                $parent_data['type'] = 'course';
                break;
 
            case 'course':
                $parent_data['ids']  = wp_list_pluck( $object->get_tracks(), 'term_id' );
                $parent_data['type'] = 'course_track';
                break;
 
        }
 
        /**
         * Filter the parent data used to cascade object completion up to an object's parent(s).
         *
         * @since 4.2.0
         *
         * @param array  $parent_data {
         *     Array of the object's parent information.
         *
         *     @type int[]  $ids  Object ids for the parent object(s).
         *     @type string $type Object type (course, course_track, etc...).
         * }
         * @param object $object      The object. An `LLMS_Course`, for example.
         * @param int    $ojbect_id   The object's ID.
         * @param string $object_type The object's type.
         */
        $parent_data = apply_filters( 'llms_mark_complete_parent_data', $parent_data, $object, $object_id, $object_type );
 
        // Reset the cached progress for any objects with children.
        if ( 'lesson' !== $object_type ) {
            $this->set( sprintf( '%1$s_%2$d_progress', $object_type, $object_id ), '' );
        }
 
        // Reset cache for all parents.
        if ( $parent_data['ids'] && $parent_data['type'] ) {
            foreach ( $parent_data['ids'] as $pid ) {
                $this->set( sprintf( '%1$s_%2$d_progress', $parent_data['type'], $pid ), '' );
            }
        }
 
        // Determine if an update should be made.
        $update = ( 'complete' === $status && $complete ) || ( 'incomplete' === $status && ! $complete );
 
        if ( $update ) {
 
            // Insert meta data.
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Uses Uses

Uses
Uses	Description
includes/abstracts/llms.abstract.user.data.php: LLMS_Abstract_User_Data	LifterLMS User Data Abstract class
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Methods Methods

add_membership_level — Add the student to a LifterLMS Membership
delete_enrollment — Delete a student enrollment.
delete_enrollment_postmeta — Remove student enrollment postmeta for a given product.
delete_quiz_attempt — Remove Student Quiz attempts
enroll — Enroll the student into a course or membership
get_achievements — Retrieve achievements that a user has earned
get_avatar
get_best_quiz_attempt — Get the quiz attempt with the highest grade for a given quiz and lesson combination
get_certificates — Retrieve certificates that a user has earned
get_completed_courses — Retrieve IDs of courses a user has completed
get_completion_date — Get the formatted date when a course or lesson was completed by the student
get_courses — Retrieve IDs of user's courses based on supplied criteria
get_enrollment_date — Get the formatted date when a user initially enrolled in a product or when they were last updated
get_enrollment_order — Retrieve the order which enrolled a student in a given course or membership.
get_enrollment_status — Get the current enrollment status of a student for a particular product
get_enrollment_trigger — Get the enrollment trigger for a the student's enrollment in a course
get_enrollment_trigger_id — Get the enrollment trigger id for a the student's enrollment in a course
get_enrollments — Retrieve IDs of user's enrollments by post type (and additional criteria)
get_events — Retrieve postmeta events related to the student
get_grade — Get the students grade for a lesson / course All grades are based on quizzes assigned to lessons
get_last_completed_lesson — Get the students last completed lesson in a course
get_membership_levels — Retrieve an array of Membership Levels for a user
get_memberships — Retrieve IDs of user's memberships based on supplied criteria
get_name — Get the full name of a student
get_next_lesson — Get the next lesson a student needs to complete in a course
get_notification_subscription — Retrieve a user's notification subscription preferences for a given type & trigger
get_orders
get_overall_grade — Retrieve the student's overall grade
get_overall_progress — Retrieve a student's overall progress Overall progress is the total percentage completed based on all courses the student is enrolled in Cached data is cleared every time the student completes a lesson
get_progress — Get students progress through a course or track
get_quiz_data — Retrieve quiz data for a student for a lesson / quiz combination
get_registration_date — Retrieve the student's original registration date in the chosen format.
insert_completion_postmeta — Add student postmeta data for completion of a lesson, section, course or track
insert_enrollment_postmeta — Add student postmeta data for enrollment into a course or membership
insert_incompletion_postmeta — Add student postmeta data for incompletion of a lesson, section, course or track An "_is_complete" value of "no" is inserted into postmeta
insert_status_postmeta — Add a new status record to the user postmeta table for a specific product
instructor — Retrieve an instance of the LLMS_Instructor model for the current user
is_active — Determine if the student is active in at least one course or membership
is_complete — Determine if the student has completed a course, track, or lesson
is_enrolled — Determine if a student is enrolled in a Course or Membership.
is_instructor — Determine if the student is a LifterLMS Instructor (of any kind)
mark_complete — Mark a lesson, section, course, or track complete for the given user
mark_incomplete — Mark a lesson, section, course, or track incomplete for the given user Gives an "_is_complete" value of "no" for the given object
quizzes — Retrieve an instance of the student quiz data model
remove_membership_level — Remove a student from a membership level.
unenroll — Remove a student from a LifterLMS course or membership
update_completion_status — Update the completion status of a track, course, section, or lesson for the current student
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Changelog Changelog

Changelog
Version	Description
6.0.0	Removed the deprecated `llms_user_removed_from_membership_level` action hook from the `LLMS_Student::unenroll()` method.
5.2.0	Changed the date to be relative to the local time zone in `get_registration_date`.
4.2.0	The `$enrollment_trigger` parameter was added to the `'llms_user_enrollment_deleted'` action hook. Added new filter to allow customization of object completion data.
4.0.0	Remove previously deprecated methods.
3.37.9	Added filters `llms_user_enrollment_allowed_post_types` & `llms_user_enrollment_status_allowed_post_types` which allow 3rd parties to enroll users into additional post types via core enrollment methods.
3.36.2	Added logic to physically remove from the membership level and remove enrollments data on related products, when deleting a membership enrollment.
3.35.0	Prepare all variables when querying for enrollment date.
3.34.0	Added new filters for differentiating between enrollment update and creation; Added the ability to check enrollment from a section.
3.33.0	Added the `delete_enrollment_postmeta` private method that allows student's enrollment postmeta deletion.
2.2.3	Introduced.
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LifterLMS

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LLMS_Student

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LifterLMS

LLMS_Student

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