Untitled

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
<title>Prueba db</title>
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(Principal);
function Principal(){
    $("#btnenv").click(loguea);
}

function loguea(){
    var email = $("#email").val();
    var passw = $("#passw").val();
    $.ajax({
        type: "POST",
        url: "http://www.nombredominiogratis.cf/tareas_u/oiga/validate.php",
        data: {mail:email,pass:passw},
        success: function(data){
            $("#olvi").html(data);
            console.log(data);
        }
    });
}

</script>
</head>
<body>
<form method="post">
  <div class="field-wrap">
    <label>Correo Electronico<span class="req">*</span></label>
    <input id="email" name="mail" type="email" required autocomplete="off"/>
  </div>
  <div class="field-wrap">
    <label>Password<span class="req">*</span></label>
    <input id="passw" name="pass" type="password" required autocomplete="off"/>
  </div>
  <p class="forgot"><a id="olvi" href="#">Aquí va el número que traigo desde el php</a></p>
</form>
<button id="btnenv" class="button button-block"/>Ingresa!</button>
<script type="text/javascript" src="cordova.js"></script>
</body>
</html>

<?php

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST');

include 'connect.php';

$mail= $_POST['mail'];
$pass= $_POST['pass'];

$invi=$db->prepare("SELECT * FROM `invitados` WHERE correo = :mail AND clave = :pass");
$invi->bindValue(':mail',$mail,PDO::PARAM_STR);
$invi->bindValue(':pass',$pass,PDO::PARAM_STR);
$invi->execute();

$user=$db->prepare("SELECT * FROM `usuarios` WHERE correo = :mail AND clave = :pass");
$user->bindValue(':mail',$mail,PDO::PARAM_STR);
$user->bindValue(':pass',$pass,PDO::PARAM_STR);
$user->execute();

if($user->rowCount()>0){                //Si el usuario está registrado
    echo 1;
}
else{                                   //sino,
    if($invi->rowCount()>0) echo 2;  //si es invitado
    else echo 3;                        //si no existe
}
?>