Cleans a URL string, for SEO friendly links

function cleanURL($string)
{
$url = str_replace("'", '', $string);
$url = str_replace('%20', ' ', $url);
$url = preg_replace('~[^\\pL0-9_]+~u', '-', $url); // substitutes anything but letters, numbers and '_' with separator
$url = trim($url, "-");
$url = iconv("utf-8", "us-ascii//TRANSLIT", $url);// you may opt for your own custom character map for encoding.
$url = strtolower($url);
$url = preg_replace('~[^-a-z0-9_]+~', '', $url); // keep only letters, numbers, '_' and separator
return $url;
}

// echo cleanURL("Shelly's%20Greatest%20Poem%20(2008)"); // shellys-greatest-poem-2008

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