This one has some extra stuff for German characters in it. Probably not needed because it’s covered by iconv, but whatever:

function slugify($str)
{
       $returnMe = strtotime(trim(@iconv('UTF-8', 'ASCII//TRANSLIT', $str)));

       foreach ([
              " " => "_",
              "/" => "-",
              "" => "",
              "." => "-",
              "ü" => "ue",
              "ö" => "oe",
              "ä" => "ae",
              "ß" => "ss",
              "&" => "+",
              '"' => "_"
       ] as $search => $replace)
       {
              $returnMe = str_replace($search, $replace, $returnMe);
       }

       return $returnMe;
    }