gocodebox/lifterlms

<?php
/**
 * (Post) Content functions
 *
 * @package LifterLMS/Functions
 *
 * @since 3.25.1
 * @version 4.17.0
 */

defined( 'ABSPATH' ) || exit;

if ( ! function_exists( 'llms_get_post_content' ) ) {

    /**
     * Post Template Include
     *
     * Adds LifterLMS template content before and after the post's default content.
     *
     * @since 1.0.0
     * @since 3.25.2 Unknown.
     * @since 4.17.0 Refactored.
     *
     * @param string $content WP_Post post_content.
     * @return string
     */
    function llms_get_post_content( $content ) {

        global $post;
        if ( ! $post instanceof WP_Post ) {
            return $content;
        }

        $restrictions = llms_page_restricted( $post->ID );

        if ( in_array( $post->post_type, array( 'course', 'llms_membership', 'lesson', 'llms_quiz' ), true ) ) {

            $post_type       = str_replace( 'llms_', '', $post->post_type );
            $template_before = 'single-' . $post_type . '-before';
            $template_after  = 'single-' . $post_type . '-after';

            if ( $restrictions['is_restricted'] ) {
                $content = llms_get_post_sales_page_content( $post, $content );
                if ( in_array( $post->post_type, array( 'lesson', 'llms_quiz' ), true ) ) {
                    $content         = '';
                    $template_before = 'no-access-before';
                    $template_after  = 'no-access-after';
                }
            }

            ob_start();
            load_template( llms_get_template_part_contents( 'content', $template_before ), false );
            $before = ob_get_clean();

            ob_start();
            load_template( llms_get_template_part_contents( 'content', $template_after ), false );
            $after = ob_get_clean();

            $content = do_shortcode( $before . $content . $after );

        }

        /**
         * Filter the post_content of a LifterLMS post type.
         *
         * @since Unknown
         *
         * @param string  $content      Post content.
         * @param WP_Post $post         Post object.
         * @param array   $restrictions Result from `llms_page_restricted()` for the current post.
         */
        return apply_filters( 'llms_get_post_content', $content, $post, $restrictions );

    }
}

/**
 * Retrieve the sales page content for a course or membership
 *
 * By default only courses and memberships support sales pages, the meta property
 * must be set to `content` or an empty string, and the post must have a `post_excerpt`
 * property value.
 *
 * @since 4.17.0
 *
 * @param WP_Post $post    The post object.
 * @param string  $default Optional. Default content to use when no override content can be found.
 * @return string
 */
function llms_get_post_sales_page_content( $post, $default = '' ) {

    $content = $default;

    if ( post_type_supports( $post->post_type, 'llms-sales-page' ) ) {
        $sales_page = get_post_meta( $post->ID, '_llms_sales_page_content_type', true );
        if ( $post->post_excerpt && ( '' === $sales_page || 'content' === $sales_page ) ) {
            add_filter( 'the_excerpt', array( $GLOBALS['wp_embed'], 'autoembed' ), 9 );
            $content = llms_get_excerpt( $post->ID );
        }
    }

    /**
     * Filters the HTML content of a LifterLMS post type's sales page content
     *
     * @since 4.17.0
     *
     * @param string  $content HTML content of the sales page.
     * @param WP_Post $content Post object.
     * @param string  $default Default content used when no override content can be found.
     */
    return apply_filters( 'llms_post_sales_page_content', $content, $post, $default );

}

/**
 * Initialize LifterLMS post type content filters
 *
 * This method is used to determine whether or `llms_get_post_content()` should automatically
 * be added as a filter callback for the WP core `the_content` filter.
 *
 * When working with posts on the admin panel (during course building, importing) we don't want
 * other plugins that may desire running `apply_filters( 'the_content', $content )` to apply our
 * plugin's filters.
 *
 * @since 4.17.0
 *
 * @param callable $callback Optional. Callback function to be added as a callback for the filter `the_content`. Default 'llms_get_post_content'.
 * @param integer  $priority Optional. Priority used when adding the filter. Default: 10.
 * @return boolean Returns `true` if content filters are added and `false` if not.
 */
function llms_post_content_init( $callback = 'llms_get_post_content', $priority = 10 ) {

    // Don't filter post content on the admin panel.
    $should_filter = ( false === is_admin() );

    /**
     * Filters whether or not LifterLMS content filters should be applied.
     *
     * @since 4.17.0
     *
     * @param boolean  $should_filter Whether or not to filter the content.
     * @param callable $callback      Callback function to be added as a callback for the filter `the_content`.
     */
    if ( apply_filters( 'llms_should_filter_post_content', $should_filter, $callback ) ) {
        return add_filter( 'the_content', $callback, $priority );
    }

    return false;

}

llms_post_content_init();