What are the potential pitfalls of using meta tags like Cache-Control, Pragma, and Expires to prevent caching in PHP?

Using meta tags like Cache-Control, Pragma, and Expires in PHP to prevent caching can be unreliable as they are meant for HTTP headers, not meta tags. To properly prevent caching in PHP, you should set the appropriate HTTP headers using the header() function. 

<?php
header("Cache-Control: no-cache, no-store, must-revalidate"); // HTTP 1.1.
header("Pragma: no-cache"); // HTTP 1.0.
header("Expires: 0"); // Proxies.
?>

Keywords

Cache-Control Pragma Expires caching PHP

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