How can the issue of being able to access a protected page by clicking the back button in the browser be prevented in a PHP script?

When a user logs out of a protected page and then clicks the back button in the browser, they may still be able to access the cached version of the page. To prevent this, we can add a cache-control header in our PHP script to disable caching for the page. 

// Prevent caching of the page
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");

Keywords

PHP session management header function authentication browser cache

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