为什么此会话变量不起作用...？

Question

I am making a game for class and when the user completes a level they proceed to the next. But as they can't be allowed to access the URL directly I have tried to create a PHP session variable in the JavaScript If statement for winning the game, like this:

if (passOnLevel == 0 && passengerCarrying == 0) {
    alert("You Win!");
<?php $_SESSION['levelCompleteC'] = 'levelOneComplete'; ?>
    window.location.href='gameL2.php';
}

In the gameL2.php file (level 2) I have this If statement at the top of my page:

<?php session_start(); ?>
<?php if (isset($_SESSION['RobotName'], $_SESSION['traction'], $_SESSION['passenger'], $_SESSION['levelCompleteC'])) {
....
....
........

However the $_SESSION variable for levelOneC to check whether the successfully completed the level seems to automatically set itself when level one loads so it doesn't actually check to see if they won the level.

Is there another way of doing this?

Answer 1

PHP is rendered BEFORE the page loads, which means that you can't come along and insert PHP code to be executed after the page loaded. Use AJAX to do your desired operation.

For easy refrence, Google "XMLHttpRequest" or see here .