<?
header("content-type: text/html; charset=utf-8");
ob_start();

echo "<?\n";
?>
// Maakt een URL-vriendelijke 'slug'
// Er vanuitgaand dat je source bestand in UTF-8 is opgeslagen en de Content-Type van je output ook UTF-8 is
function slug($title) {
	$title = html_entity_decode($title, ENT_QUOTES);
	$title = strtr($title,
		utf8_decode('ŠŒŽšœžŸ¥µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ'),
		            'SOZsozYYuAAAAAAACEEEEIIIIDNOOOOOOUUUUYsaaaaaaaceeeeiiiionoooooouuuuyy');

	$allowed = "abcdefghijklmnopqrstuvwxyz0123456789-";
	$out = "";
	$t = strtolower(html_entity_decode($title));
	$l = "";
	for($i = 0; $i < strlen($t); $i++) {
			$c = $t[$i];
			if($c == " ") $c = "-";
			if(strpos($allowed, $c) !== false) {
				if(!($l == "-" && $c == "-")) {
					$out .= $c;
				}
				$l = $c;
			}
	}
	return $out;
}
<?
echo "?>\n";
$c = ob_get_contents();
ob_end_clean();

highlight_string($c);
?>