$html_match ) { $el = $matches[0][ $key ]; $src = $matches[1][ $key ]; if (strpos($src, 'youtube') !== false) { $new_el = str_replace( 'class="fg-item-inner', 'class="fg-item-inner cmplz-placeholder-element ', $el ); $html = str_replace( $el, $new_el, $html ); } } } } return $html; } add_filter( 'cmplz_cookie_blocker_output' , 'my_foo_gallery_block_content' ); function my_cmplz_foo_gallery_css() { if ( cmplz_uses_thirdparty('youtube') ) { ?>