Strip alpha characters

[nikko50]

Hi all. Is there a function to strip all alpha characters?? Thanks

[Installer]

There is now:

function strip_alpha($str)
{
    $new_str = '';
    for ($i = 0; $i < strlen($str); $i++) {
        if (!ctype_alpha($str{$i})) {
            $new_str .= $str{$i};
        }
    }
    return $new_str;
}