public static function login( $data ) {

		/**
		 * Run an action prior to user login.
		 *
		 * @since 3.0.0
		 *
		 * @param array $data {
		 *    User login credentials.
		 *
		 *    @type string $user_login User's username.
		 *    @type string $password User's password.
		 *    @type bool $remeber Whether to extend the cookie duration to keep the user logged in for a longer period.
		 * }
		 */
		do_action( 'lifterlms_before_user_login', $data );

		/**
		 * Filter user submitted login data prior to data validation.
		 *
		 * @since 3.0.0
		 *
		 * @param array $data {
		 *    User login credentials.
		 *
		 *    @type string $user_login User's username.
		 *    @type string $password User's password.
		 *    @type bool $remeber Whether to extend the cookie duration to keep the user logged in for a longer period.
		 * }
		 */
		$data = apply_filters( 'lifterlms_user_login_data', $data );

		// Validate the fields & allow custom validation to occur.
		$valid = self::validate_login_fields( $data );

		// If errors found, return them.
		if ( is_wp_error( $valid ) ) {

			/**
			 * Filters the errors found during a LifterLMS user login attempt
			 *
			 * @since Unknown
			 *
			 * @param WP_Error       $valid  Error object containing information about the login error.
			 * @param array          $data   User submitted login form data.
			 * @param WP_Error|false $signon The original WP Error object returned by `wp_signon()` or false if the error
			 *                               is encountered prior to the signon attempt.
			 */
			return apply_filters( 'lifterlms_user_login_errors', $valid, $data, false );

		}

		$creds = array(
			'user_login'    => wp_unslash( $data['llms_login'] ), // Unslash ensures that an email address with an apostrophe is unescaped for lookups.
			'user_password' => $data['llms_password'],
			'remember'      => isset( $data['llms_remember'] ),
		);

		/**
		 * Filter a user's login credentials immediately prior to signing in.
		 *
		 * @since Unknown
		 *
		 * @param array $creds {
		 *    User login credentials.
		 *
		 *    @type string $user_login User's username.
		 *    @type string $password User's password.
		 *    @type bool $remeber Whether to extend the cookie duration to keep the user logged in for a longer period.
		 * }
		 */
		$creds  = apply_filters( 'lifterlms_login_credentials', $creds );
		$signon = wp_signon( $creds, is_ssl() );

		if ( is_wp_error( $signon ) ) {

			$err = new WP_Error( 'login-error', __( 'Could not find an account with the supplied email address and password combination.', 'lifterlms' ) );
			// This hook is documented in includes/class.llms.person.handler.php.
			return apply_filters( 'lifterlms_user_login_errors', $err, $data, $signon );

		}

		return $signon->ID;

	}