PHP disable cache on all browser

Question

I would like to prevent all browser from caching the file script.php

I have the file script.php show a random number :

<?php
$response = "document.write('" . rand(0,999999) . "');"; // Show random number
header('Cache-Control: no-cache, no-store, must-revalidate');
header('Pragma: no-cache');
header('Expires: 0');
header('Content-Type', 'application/javascript');
echo $response;

and test.html :

<script src="script.php"></script>
<script src="script.php"></script>
<script src="script.php"></script>

When i open test.html page on Firefox, the file script.php is not cached and i get 3 differents random number. But on IE or Chrome, I got 3 times the same number that mean the browser cache has been used. Why Chrome and IE cache don't load 3 time the file? How to prevent that?

possible duplicate of Disable cache for dynamic created Javascript — spenibus
– spenibus, Commented Jul 13, 2015 at 22:53

Khalic · Accepted Answer · 2015-07-12 09:11:08Z

1

You can add a cache buster parameter when calling the script:

<script src="script.php?v=<?php echo mt_rand(1, 9999999) ?>"></script>
<script src="script.php?v=<?php echo mt_rand(1, 9999999) ?>"></script>
<script src="script.php?v=<?php echo mt_rand(1, 9999999) ?>"></script>

Enjoy

edited Jul 12, 2015 at 9:11

answered Jul 12, 2015 at 9:05

Khalic

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1 Comment

Siol Over a year ago

I forget to tell but i can't use random number in the url. The integration code <script src="script.php"></script> canot change.

NorthernLights · Accepted Answer · 2015-07-12 11:44:27Z

1

Try this

<?php
   header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
   header("Cache-Control: post-check=0, pre-check=0", false);
   header("Pragma: no-cache");
?>

answered Jul 12, 2015 at 11:44

NorthernLights

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