<?php 

'method' => function( $string, $sep  ) {
    return strtolower(str_replace(['ü', 'Ü', 'ö', 'Ö',' ',"Ç","ç","ı","I","İ","Ş","ş","&","/","Ğ","ğ"], ['u', 'u', 'o', 'o','-',"c","c","i","i","i","s","s","","","g","g"], $string));
},