sef (dinamik url) için en iyi fonksiyon

arkadaşlar bi sef (dinamik url) için birkaç tane fonksiyon kullandım ama hep sorunla karşılaşıyorum. sizin kullandığın en iyi fonksiyon nedir?

		function duzelt($string){
			$turkce=array("ş", "Ş", "ı", "ü", "Ü", "ö", "Ö", "ç", "Ç", "ş", "Ş", "ı", "ğ", "Ğ", "İ", "ö", "Ö", "Ç", "ç", "ü", "Ü");
			$duzgun=array("s", "s", "i", "u", "u", "o", "o", "c", "c", "s", "s", "i", "g", "g", "i", "o", "o", "c", "c", "u", "u");
			$string = str_replace($turkce, $duzgun, $string);
			return strtolower(trim(preg_replace('~[^0-9a-z]+~i', '-', html_entity_decode(preg_replace('~&([a-z]{1,2})(?:acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($string, ENT_QUOTES, 'UTF-8')), ENT_QUOTES, 'UTF-8')), '-'));
		}

function urlYap($baslik){
   $baslik = str_replace(array(""","'"), NULL, $baslik);
		$bul = array('Ç', 'Ş', 'Ğ', 'Ü', 'İ', 'Ö', 'ç', 'ş', 'ğ', 'ü', 'ö', 'ı', '-');
		$yap = array('c', 's', 'g', 'u', 'i', 'o', 'c', 's', 'g', 'u', 'o', 'i', ' ');
		$perma = strtolower(str_replace($bul, $yap, $baslik));
		$perma = preg_replace("@[^A-Za-z0-9\-_]@i", ' ', $perma);
		$perma = trim(preg_replace('/\s+/',' ', $perma));
		$perma = str_replace(' ', '-', $perma);
		return $perma;
}

function sanitize($url)
{

$url = trim($url);
$find = array('<b>', '</b>');
$url = str_replace ($find, '', $url);
$url = preg_replace('/<(\/{0,1})img(.*?)(\/{0,1})\>/', 'image', $url);
$find = array(' ', '&amp;amp;amp;quot;', '&amp;amp;amp;amp;', '&amp;amp;amp;', '\r\n', '\n', '/', '\\', '+', '<', '>');
$url = str_replace ($find, '-', $url);
$find = array('é', 'è', 'ë', 'ê', 'É', 'È', 'Ë', 'Ê');
$url = str_replace ($find, 'e', $url);
$find = array('í', 'ý', 'ì', 'î', 'ï', 'I', 'Ý', 'Í', 'Ì', 'Î', 'Ï','İ','ı');
$url = str_replace ($find, 'i', $url);
$find = array('ó', 'ö', 'Ö', 'ò', 'ô', 'Ó', 'Ò', 'Ô');
$url = str_replace ($find, 'o', $url);
$find = array('á', 'ä', 'â', 'à', 'â', 'Ä', 'Â', 'Á', 'À', 'Â');
$url = str_replace ($find, 'a', $url);
$find = array('ú', 'ü', 'Ü', 'ù', 'û', 'Ú', 'Ù', 'Û');
$url = str_replace ($find, 'u', $url);
$find = array('ç', 'Ç');
$url = str_replace ($find, 'c', $url);
$find = array('þ', 'Þ','ş','Ş');
$url = str_replace ($find, 's', $url);
$find = array('ð', 'Ð','ğ','Ğ');
$url = str_replace ($find, 'g', $url);
$find = array('/[^A-Za-z0-9\-<>]/', '/[\-]+/', '/<[^>]*>/');
$repl = array('', '-', '');
$url = preg_replace ($find, $repl, $url);
$url = str_replace ('--', '-', $url);
$url = strtolower($url);
return $url;
}