function modrewrite($s){
    $tr = array('ş','Ş','ı','İ','ğ','Ğ','ü','Ü','ö','Ö','ç','Ç');
    $en = array('s','s','i','i','g','g','u','u','o','o','c','c');
    $s = str_replace($tr,$en,$s);
    $s = strtolower($s);
    $s = preg_replace('/&.+?;/', '-', $s);
    $s = preg_replace('/[^%a-z0-9 _-]/', '-', $s);
    $s = preg_replace('/\s+/', '-', $s);
    $s = preg_replace('|-+|', '-', $s);
    $s = str_replace("--","-",$s);
    $s = trim($s, '-');
    return $s;
}