Slugify PHP Function

slugify.php

function slugify($str) {
    // Convert to lowercase and remove whitespace
    $str = strtolower(trim($str));

    // Replace high ascii characters
    $chars = array("ä", "ö", "ü", "ß");
    $replacements = array("ae", "oe", "ue", "ss");
    $str = str_replace($chars, $replacements, $str);
    $pattern = array("/(é|è|ë|ê)/", "/(ó|ò|ö|ô)/", "/(ú|ù|ü|û)/");
    $replacements = array("e", "o", "u");
    $str = preg_replace($pattern, $replacements, $str);

    // Remove puncuation
    $pattern = array(":", "!", "?", ".", "/", "'");
    $str = str_replace($pattern, "", $str);

    // Hyphenate any non alphanumeric characters
    $pattern = array("/[^a-z0-9-]/", "/-+/");
    $str = preg_replace($pattern, "-", $str);

    return $str;
}