(.*?)<\/\1>/is',
function ( $matches ) use ( &$used_ids, $permalink ) {
$tag = $matches[1];
$attrs = $matches[2];
$text = wp_strip_all_tags( $matches[3] );
// Skip if class contains sp-smart-post-title.
if ( preg_match( '/class=["\'][^"\']*sp-smart-post-title[^"\']*["\']/', $attrs ) ) {
return $matches[0];
}
// Skip if ID already exists.
if ( preg_match( '/id=["\'].*?["\']/', $attrs ) ) {
return $matches[0];
}
$id = sanitize_title( $text );
while ( in_array( $id, $used_ids, true ) ) {
$id .= '-' . wp_rand( 10, 99 );
}
$used_ids[] = $id;
return sprintf(
'<%1$s%2$s>%4$s#',
$tag,
$attrs,
esc_attr( $id ),
$matches[3],
esc_url( $permalink )
);
},
$content
);
}
/**
* Add id to heading function
*
* @param string $content Post content.
* @param string $permalink Post permalink.
* @return string $content HTML markup.
*/
private function add_ids_to_headings( $content, $permalink ) {
if ( empty( $content ) ) {
return $content;
}
return $this->add_ids_to_headings_fallback( $content, $permalink );
}
/**
* Check table of content function
*
* @param string $content Post content.
* @return boolean
*/
private function has_toc_block( $content ) {
return preg_match( '/