$tr = array('Ş','ş','İ','ı','Ğ','ğ','Ü','ü','Ö','ö','Ç','ç');
 
$eng = array('s','s','i','i','g','g','u','u','o','o','c','c');
 
$s = str_replace($tr,$eng,$s);

$s = preg_replace('/[^%a-z0-9 _-]/', '', $s);