util.php

<?php

function seo($url) {
	$url = strToLower($url);
	$url = str_replace(
		array("á", "é", "í", "ó", "ú", "ñ", "ü"),
		array("a", "e", "i", "o", "u", "n", "u"),
		$url);
	$tokens = preg_split("/[^a-zA-Z0-9]+/", $url);
	$url = implode("-", $tokens);
	$url = trim($url, "-");
	return $url;
}

echo seo(" Extraño alijo hampón: güisqui; kiwi, vid y ... ¡¿bizc8?! ");