How can using meta tags like <meta http-equiv="expires" content="3600"> affect page load times in PHP?

Using meta tags like <meta http-equiv="expires" content="3600"> can potentially improve page load times by instructing the browser to cache the page for a specific period (in this case, 3600 seconds or 1 hour). This means that the browser will not need to request the page from the server again within that time frame, resulting in faster loading times for subsequent visits to the page.

<?php
header("Cache-Control: max-age=3600");
?>