generar 16 digitos de manera aleatoria

[chulifo]

Código PHP:

function rand_str($length =5){
    $chars = '124567890';
    $chars_length = (strlen($chars) - 1);
    $string = $chars{rand(0, $chars_length)};
    for ($i = 1; $i < $length; $i = strlen($string))
    {
        $r = $chars{rand(0, $chars_length)};
        if ($r != $string{$i - 1}) $string .= $r;
    }
    return $string;
}
echo rand_str(16);