问有PHP函数从自然文本生成漂亮有效的URL吗？

EN

/**
 * Modifies a string to remove al non ASCII characters and spaces.
 */
static public function slugify($text)
{
    // replace non letter or digits by -
    $text = preg_replace('~[^\\pL\d]+~u', '-', $text);

    // trim
    $text = trim($text, '-');

    // transliterate
    if (function_exists('iconv'))
    {
        $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
    }

    // lowercase
    $text = strtolower($text);

    // remove unwanted characters
    $text = preg_replace('~[^-\w]+~', '', $text);

    if (empty($text))
    {
        return 'n-a';
    }

    return $text;
}

function fix_url($word) {
    /**
     * whilst the descriptor in the url will be for SEO     
     * purposes only, we need to ensure it doesn't break
     * the URI rules http://www.faqs.org/rfcs/rfc2396.html
     */  

    // convert to lower case
    $word=strtolower($word);

    // define illegal / replacement characters
    $illegal = array("ä","ö","ü","ß");
    $replace = array("a","o","u","ss");
    $word = str_replace($illegal, $replace, $word);

    // remove & for and
    $word=str_replace("&","and",$word);

    // remove a space for -
    $word=str_replace(" ","-",$word);

    // and replace all non alphanumeric characters or a dash
    $word=ereg_replace("[^A-Za-z0-9-]", "", $word);
    return $word;
}