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Editorial Team
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Asked: 2026-05-24T17:39:56+00:00

What scope to php variables have with regards to AJAX calls? So for example,

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What scope to php variables have with regards to AJAX calls? So for example, a file main.php creates an instance of a class Test:

<html>
  <head>
    <?php
      require_once 'test.php';
      $test = new Test('some parameter');
    ?>
  </head>
  <body></body>

</html>

Later on there is a jQuery post event triggered by some event:

$(document).ready(function() {

  $.post(   
    "class/start.php",   
    function(data) {
      // some functioning.              
    }, "json");

});

Then in start.php I need access to the class I defined in main.php. E.g.:

<?php
  echo json_encode($test->SomeFunction());
?>

From testing this I’m fairly sure this isn’t possible. I assume the scope of $test dies when main.php comes from the server. So what do I need to do to access the instance of that class? Do I need to add $test as a session variable or is there some other better way?

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1 Answer

  1. Editorial Team

    You could session_start() and put $test in $_SESSION['whatever'].

    You’ll need to session_start() as the first thing in the php activity for both HTTP requests. In the second HTTP request, just json_decode() the object and then add it to $_SESSION['whatever'].

    In case you’re not familiar with sessions, they basically give you the ability to retain state, storing state data in $_SESSION[]. See here: http://www.php.net/manual/en/function.session-start.php

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