ID, $prefix . 'title', true ); $customcontent = '

' . $output_content . '

'; $customcontent .= $content; return $customcontent; } /** * Adding Hooks * * @package Subtitle * @since 1.0.0 */ public function add_hooks() { //add filter to append the content with custom markup add_filter('the_content', array($this, 'wpd_sub_title_add_content_after_header')); } } ?>