Wordpress Automatische interne Verlinkung ohne plugin?

function replace_text_wps($text){    $replace = array(        // 'WORD TO REPLACE' => 'REPLACE WORD WITH THIS'        'dein Text' => '<a href="dein Link">Link Text</a>',        'function' => '<a href="#">function</a>'    );    $text = str_replace(array_keys($replace), $replace, $text);    return $text;}add_filter('the_content', 'replace_text_wps');add_filter('the_excerpt', 'replace_text_wps');add_filter('the_title', 'replace_text_wps');add_filter('acf_the_content', 'replace_text_wps');