code

function Randstr($length = 32) {
    $validCharacters = "abcdefghijklmnopqrstuxyvwzABCDEFGHIJKLMNOPQRSTUXYVWZ1234567890";
    $validCharNumber = strlen($validCharacters);

    $result = "";

    for ($i = 0; $i < $length; $i++) {
        $index = mt_rand(0, $validCharNumber - 1);
        $result .= $validCharacters[$index];
    }

    return $result;
}