Трансктрипция ЧПУ

function lang_slug($string){
 
    $string    = strip_tags(trim($string));
    $string    = mb_strtolower($string, 'utf-8');
    $string    = str_replace(' ', '-', $string);
 
    $slug = preg_replace ('/[^a-zа-яё0-9\-\/]/u', '-', $string);
    $slug = preg_replace('/([-]+)/i', '-', $slug);
    $slug = trim($slug, '-');
 
    $ru_en = array(
                    'а'=>'a','б'=>'b','в'=>'v','г'=>'g','д'=>'d',
                    'е'=>'e','ё'=>'yo','ж'=>'zh','з'=>'z',
                    'и'=>'i','й'=>'i','к'=>'k','л'=>'l','м'=>'m',
                    'н'=>'n','о'=>'o','п'=>'p','р'=>'r','с'=>'s',
                    'т'=>'t','у'=>'u','ф'=>'f','х'=>'h','ц'=>'c',
                    'ч'=>'ch','ш'=>'sh','щ'=>'sch','ъ'=>'','ы'=>'y',
                    'ь'=>'','э'=>'e','ю'=>'yu','я'=>'ja'
                    );
 
    foreach($ru_en as $ru=>$en){
        $slug = str_replace($ru, $en, $slug);
    }
 
    if (!$slug){ $slug = 'untitled'; }
    if (is_numeric($slug)){ $slug .= strtolower(date('F')); }
 
    return $slug;
 
}