function generate_pass_random(){

    $cadenaRandom = "";
    $cadena = chr(rand(ord("a"), ord("z")));
    for ($i = 1; $i < 5; $i++) {
        $cadena .= chr(rand(ord("a"), ord("z")));
        $cadena .= rand(1, 9);
    }
    return $cadenaRandom;
}