MemberPress: Custom Course Overview Shortcode for Better Preview

use memberpress\courses\models as models;

// Register classroom Styles

function wpdocs_register_plugin_styles() {

	wp_enqueue_style( 'mpcs-fontello-styles', plugins_url( 'memberpress-courses/public/fonts/fontello/css/mp-courses.css' ) );

	wp_enqueue_style( 'mpcs-progress', plugins_url( 'memberpress-courses/public/css/progress.css' ) );

}

add_action( 'wp_enqueue_scripts', 'wpdocs_register_plugin_styles' );

// The "[mepr-mpcs-course-overview]" shortcode

add_shortcode( 'mepr-mpcs-course-overview', function( $attributes ) {

    $content = '';

    if( isset( $attributes['course_id'] ) && is_numeric( $attributes['course_id'] ) ) {

      $course = new models\Course( $attributes['course_id'] );

    }

    elseif( isset( $attributes['section_id'] ) && is_numeric( $attributes['section_id'] ) ) {

      $section = new models\Section( $attributes['section_id'] );

      $course = $section->course();

    }

    elseif( isset( $attributes['lesson_id'] ) && is_numeric( $attributes['lesson_id'] ) ) {

      $lesson = new models\Lesson( $attributes['lesson_id'] );

      $course = $lesson->course();

    }

    elseif( isset( $attributes['quiz_id'] ) && is_numeric( $attributes['quiz_id'] ) ) {

      $quiz = new models\Quiz( $attributes['quiz_id'] );

      $course = $quiz->course();

    }

    $current_user_id = 0;

    if( is_user_logged_in() ) {

      $current_user_id = get_current_user_id();

    }

    if( isset( $course ) && $course !== false ) {

      \ob_start();

        ?>

          <div class="mpcs-course-overview">

        <?php

        if( isset( $attributes['hide_title'] ) && ( $attributes['hide_title'] == 'true' || $attributes['hide_title'] == 1 ) ):

        else:

          ?>

            <h2 class="mpcs-course-title"><?php echo $course->post_title; ?></h2>

          <?php

        endif;

	  $sections = $course->sections();

		   require(\MeprView::file('/courses/courses_section_lesson_list'));

        ?>

          </div>

        <?php

      $content = \ob_get_clean();

    }

    return $content;

} );