MemberPress: Hide Protected Posts from Search Results

function mepr_exclude_protected_posts_from_search( $query ) {

  if( !$query->is_admin && $query->is_search && $query->is_main_query() ) {

    $posts_to_exclude = array();

    $posts = get_posts( array(

      'post_type' => get_post_types(),

      'numberposts' => -1

    ));

    foreach( $posts as $post ) {

      if( MeprRule::is_locked( $post ) ) {

        $posts_to_exclude[] = $post->ID;

      }

    }

    if( !empty( $posts_to_exclude ) ) {

      $query->set( 'post__not_in', $posts_to_exclude );

    }

  }

}

add_action( 'pre_get_posts', 'mepr_exclude_protected_posts_from_search' );