как сделать ЧПУ на транслите?

function translit($text){

$symbs = array( "а" => "a","б" => "b","в" => "v","г" => "g","д" => "d",
"е" => "e","ё" => "e","ж" => "j","з" => "z","и" => "i",
"й" => "iy","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" => "ts","ч" => "ch",
"ш" => "sh","щ" => "sch","ъ" => "","ы" => "y","ь" => "",
"э" => "e","ю" => "yu","я" => "ya","-" => "_","–" => "_",
'"' => "","»" => "","«" => "","“" => "","”" => "",",
" => "",":" => "","?" => "","!" => "","." => "",
"%" => "_procent"," " => "_","," => "","—" => "");

$result = strtr(strtolower($text),$symbs);

$result = preg_replace("/___/","_",$result);
$result = preg_replace("/__/","_",$result);

return $result;
}