มีปัญหากับโค้ด Login แบบ php pdo กับ jquery ครับ เหมือนมันไม่ส่งค่าไป รบกวนทีครัย

<?php
include 'connect.php'; // include the library for database connection

if(isset($_POST['action']) && $_POST['action'] == 'login'){ // Check the action `login`
	$username 		= trim($_POST['username']); // Get the username
	$password 		= trim($_POST['password']); // Get the password and decrypt it

	$sql = $db->prepare('SELECT * 
						 FROM  tbl_user 
						 WHERE uLogin = :username AND uPassword = :password' );
 	$sql->bindParam(':username', $username);
 	$sql->bindParam(':password', $password);
 	$sql->execute();
        $rowCount = $sql->rowCount();
 	$results = $sql->fetch(PDO::FETCH_ASSOC);

 	if($rowCount > 0){ 
		$_SESSION['user'] = $results['uLogin'];
		$_SESSION['pass'] = $results['uPassword'];
		$_SESSION['fullname'] = $results['uFullName'];
		echo 1;
	}
	else { // If no users exist with posted credentials print 0 like below.
		echo 0;
	}
}
?>

<?php
session_start();
date_default_timezone_set('Asia/Bangkok');
error_reporting (E_ALL ^ E_NOTICE);

try {
	$db = new PDO('mysql:host=localhost;dbname=statis;charset=utf8', 'root', 'root');
	$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	//echo "Database connected";
}
catch(PDOException $e) {
 echo 'ERROR: ' . $e->getMessage();
}
?>

<script type="text/javascript">
  $(document).ready(function(){
  $('#username').focus(); // Focus to the username field on body loads
  $('#login').click(function(){ // Create `click` event function for login
    var username = $('#username'); // Get the username field
    var password = $('#password'); // Get the password field
    var login_result = $('.login_result'); // Get the login result div
    login_result.html('<img src=img/ajax-load.gif /> loading..'); // Set the pre-loader can be an animation
    if(username.val() == ''){ // Check the username values is empty or not
      username.focus(); // focus to the filed
      login_result.html('<span class="error red-text">กรุณากรอกชื่อผู้ใช้</span>');
      return false;
    }
    if(password.val() == ''){ // Check the password values is empty or not
      password.focus();
      login_result.html('<span class="error red-text">กรุณากรอกรหัสผ่าน</span>');
      return false;
    }
    if(username.val() != '' && password.val() != ''){ // Check the username and password values is not empty and make the ajax request
      var UrlToPass = 'action=login&username='+username.val()+'&password='+password.val();
      $.ajax({ // Send the credential values to another checker.php using Ajax in POST menthod
      type : 'POST',
      data : UrlToPass,
      url  : 'check-login.php',
      success: function(responseText){ // Get the result and asign to each cases
        if(responseText == 0){
          login_result.html('<span class="error red-text">ชื่อผู้ใช้หรือรหัสผ่านผิด !</span>');
        }
        else if(responseText == 1){
          window.location = 'index.php';
        }
        else{
          alert('Problem with sql query');
        }
      }
      });
    }
    return false;
  });
});
</script>