AJAX PHP在Node.js中不起作用

The Problem:

When I put a PHP file link in the browser, it works perfectly fine and updates my database as expected.

When I call it with ajax from node.js, it echoes the success message but the DB does not update.

The Session variables are undefined, so when I changed them to real numbers the code still did not work. What is going wrong?

My PHP Code:

subtract5.php:

<?php
header('Access-Control-Allow-Origin: http://cashballz.net:3000', false);
include 'mysql.php'; 
session_start(); 

$cash_amount = $_SESSION['cash_amount'];
$userid = $_SESSION['id'];
$_SESSION['cash_amount'] -= 0.05;

$mysql = new Mysql(); 

$result = $mysql->setCashAmount($cash_amount,$userid); 
if($result) 
{ 
echo $cash_amount; 
} 
else 
{ 
session_start(); 
session_unset(); 
session_destroy(); 
}
?>

mysql.php:

<?php
class Mysql 
{ 
protected $dsn; 
protected $username; 
protected $password; 
public $db; 


function __construct() 
{ 
//change this to your info (myDBname, myName, myPass) 
$this->dns= 'mysql:dbname=cashball_accounts;host=localhost;charset=utf8'; 
$this->username= 'myUser'; 
$this->password= 'myPass'; 
$this->db = new PDO($this->dns, $this->username, $this->password); 
} 


public function setCashAmount($cash_amount, $id) 
{ 
$sql = "UPDATE users SET cash_amount = :cash_amount - 0.05 WHERE id = :id"; 
$stmt = $this->db->prepare($sql); 
$stmt->bindParam(':cash_amount', $cash_amount, PDO::PARAM_STR); 
$stmt->bindParam(':id', $id, PDO::PARAM_STR); 
$result = $stmt->execute(); 
return $result; 
} 

} 
?>

My node.js (app.js) AJAX:

//cut 5 cents from account - php function
        $.ajax({
        type: "POST",
        url: 'http://cashballz.net/game/5game/subtract5.php',
        data: {}, 
        success: function (data) {
            alert(data);
        }
    });

Recap:

• PHP File works from site.com with the same AJAX code, and by putting its link in the browser.
• PHP File is executed from node, but does not update the DB
• PHP File has undefined $_SESSION variables but when replaced, the DB still does not update

Possible solutions:

• Is there extra code i can put in AJAX to tell it to "pipe" the call to site.com to call the file instead of calling it straight from node?

Extra Info:

• No errors in error logs or console
• I need to use AJAX to input data into the file later on
• Solution must be secure

Thanks for the help!