Untitled

<!DOCTYPE html>
<html lang="es">
<head>
  <meta charset="utf-8"> <title>santiago</title>
</head>
<body>
  <form method="POST">
    <input type="text" name="user" placeholder="input user"/>
    <input type="text" name="pass" placeholder="input pass"/>
    <input type="submit" name="send" value="Log In"/>
  </form>
</body>

<?php
  final class Validate
  {

      public function type_data($data, $type) {
        #integer, double, NULL, object, string
        if(gettype($data) == $type)
            echo "correcto";
        else{
          try {
            settype($data, $type); // se intenta convertir en tipo de dato especificado
            echo gettype($data);
            return $data;
          } catch (Exception $e) {
            echo "no se ha podido convertir";
            //echo 'Excepción capturada: ',  $e->getMessage(), "\n";
          }
        }
      }

      public function extencion($data, $length){
        if(strlen($data) > $length)
          $data = substr($data, 0, $length); // recortara la cadena
        return $data;
      }
      public function entidades_html($data) {
        // convertimos en entidades html los caracteres < >
        $data = str_replace("<", "&#60", $data);
        $data = str_replace(">", "&#62", $data);
        return $data;
      }
      public function only_num_letter($data){
        // eliminamos lo que no es un numero o letra
        $data = ereg_replace("[^A-Za-z0-9]", "", $data);
        return $data;
      }
  }

  if(isset($_POST["send"]))
  {
    $user = $_POST["user"];
    $pass = $_POST["pass"];

    if(!empty($user) and !empty($pass)){
      // validando campos
      $o_validar = new Validate();
      //echo $user = $o_validar->extencion($user, 5);
      echo $pass = $o_validar->type_data($pass ,"integer");
      //$user = $o_validar->only_num_letter($user);
      //$pass = $o_validar->only_num_letter($pass);
      //echo $pass;

    }
    else{ die("campos vacios, VETE"); }
  }
  else{
    //echo "&#62";
  }

?>

</html>