LifterLMS_Helper

LifterLMS_Helper class

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File: libraries/lifterlms-helper/class-lifterlms-helper.php

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final class LifterLMS_Helper {
 
    /**
     * Current Plugin Version
     *
     * @var string
     */
    public $version = '3.5.0';
 
    /**
     * Singleton instance reference
     *
     * @var null
     */
    protected static $instance = null;
 
    /**
     * Instance of the LLMS_Helper_Upgrader class
     *
     * Use/retrieve via llms_helper()->upgrader().
     *
     * @var null|LLMS_Helper_Upgrader
     */
    private $upgrader = null;
 
    /**
     * Retrieve the main Instance of LifterLMS_Helper
     *
     * @since 3.0.0
     * @since 3.2.0 Use `self::$instance` in favor of `self::$_instance`.
     *
     * @return LifterLMS_Helper
     */
    public static function instance() {
        if ( is_null( self::$instance ) ) {
            self::$instance = new self();
        }
        return self::$instance;
    }
 
    /**
     * Constructor, get things started!
     *
     * @since 1.0.0
     * @since 3.4.0 Only localize when loaded as an independent plugin.
     *
     * @return void
     */
    private function __construct() {
 
        // Define class constants.
        $this->define_constants();
 
        /**
         * When loaded as a library included by the LifterLMS core localization is handled by the LifterLMS core.
         *
         * When the plugin is loaded by itself as a plugin, we must localize it independently.
         */
        if ( ! defined( 'LLMS_HELPER_LIB' ) || ! LLMS_HELPER_LIB ) {
            add_action( 'init', array( $this, 'load_textdomain' ), 0 );
        }
 
        add_action( 'plugins_loaded', array( $this, 'init' ) );
 
    }
 
    /**
     * Inititalize the Plugin
     *
     * @since 1.0.0
     * @since 3.0.0 Unknown.
     * @since 3.2.0 Use `llms()` in favor of deprecated `LLMS()`.
     * @since 3.3.1 Load the upgrader instance in WP_CLI context.
     *
     * @return void
     */
    public function init() {
 
        // Only load if we have the minimum LifterLMS version installed & activated.
        if ( function_exists( 'llms' ) && version_compare( '3.22.0', llms()->version, '<=' ) ) {
 
            $this->includes();
            $this->crons();
 
            if ( is_admin() || ( defined( 'WP_CLI' ) && WP_CLI ) ) {
                $this->upgrader = LLMS_Helper_Upgrader::instance();
            }
        }
 
    }
 
    /**
     * Schedule and handle cron functions
     *
     * @since 3.0.0
     *
     * @return void
     */
    private function crons() {
 
        add_action( 'llms_helper_check_license_keys', array( 'LLMS_Helper_Keys', 'check_keys' ) );
 
        if ( ! wp_next_scheduled( 'llms_helper_check_license_keys' ) ) {
            wp_schedule_event( time(), 'daily', 'llms_helper_check_license_keys' );
        }
 
    }
 
    /**
     * Define constants for plugin
     *
     * @since 1.0.0
     *
     * @return void
     */
    private function define_constants() {
 
        if ( ! defined( 'LLMS_HELPER_VERSION' ) ) {
            define( 'LLMS_HELPER_VERSION', $this->version );
        }
 
    }
 
    /**
     * Include all clasess required by the plugin
     *
     * @since 1.0.0
     * @since 3.0.0 Include new files.
     *
     * @return void
     */
    private function includes() {
 
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-admin-add-ons.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-assets.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-betas.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-cloned.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-install.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-keys.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-options.php';
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/class-llms-helper-upgrader.php';
 
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/models/class-llms-helper-add-on.php';
 
        require_once LLMS_HELPER_PLUGIN_DIR . 'includes/functions-llms-helper.php';
 
    }
 
    /**
     * Load l10n files.
     *
     * This method is only used when the plugin is loaded as a standalone plugin (for development purposes),
     * otherwise (when loaded as a library from within the LifterLMS core plugin) the localization
     * strings are included into the LifterLMS Core plugin's po/mo files and are localized by the LifterLMS
     * core plugin.
     *
     * Files can be found in the following order (The first loaded file takes priority):
     *   1. WP_LANG_DIR/lifterlms/lifterlms-rest-LOCALE.mo
     *   2. WP_LANG_DIR/plugins/lifterlms-rest-LOCALE.mo
     *   3. WP_CONTENT_DIR/plugins/lifterlms-rest/i18n/lifterlms-rest-LOCALE.mo
     *
     * Note: The function `load_plugin_textdomain()` is not used because the same textdomain as the LifterLMS core
     * is used for this plugin but the file is named `lifterlms-rest` in order to allow using a separate language
     * file for each codebase.
     *
     * @since 2.5.0
     * @since 3.4.0 Updated to the core textdomain.
     *
     * @return void
     */
    public function load_textdomain() {
 
        // Load locale.
        $locale = apply_filters( 'plugin_locale', get_locale(), 'lifterlms' );
 
        // Load from the LifterLMS "safe" directory if it exists.
        load_textdomain( 'lifterlms', WP_LANG_DIR . '/lifterlms/lifterlms-helper-' . $locale . '.mo' );
 
        // Load from the default plugins language file directory.
        load_textdomain( 'lifterlms', WP_LANG_DIR . '/plugins/lifterlms-helper-' . $locale . '.mo' );
 
        // Load from the plugin's language file directory.
        load_textdomain( 'lifterlms', LLMS_HELPER_PLUGIN_DIR . '/i18n/lifterlms-helper-' . $locale . '.mo' );
    }
 
    /**
     * Return the singleton instance of the LLMS_Helper_Upgader
     *
     * @since 3.0.0
     *
     * @return LLMS_Helper_Upgrader
     */
    public function upgrader() {
        return $this->upgrader;
    }
 
}

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Changelog
Version Description
3.2.0 Moved class to its own file from lifterlms-helper.php. Replaced class variable $_instance with $instance.
1.0.0 Introduced.

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