What are the implications of caching headers in PHP on browser behavior and page display?

Caching headers in PHP can improve website performance by instructing the browser to store certain resources locally for a specified period of time. This can reduce load times for returning visitors and decrease server load. However, improper caching settings can lead to outdated content being displayed to users. 

// Set caching headers to cache resources for 1 hour
$expires = 3600;
header("Cache-Control: max-age=$expires");
header("Expires: " . gmdate("D, d M Y H:i:s", time() + $expires) . " GMT");

Keywords

caching headers PHP browser behavior page display implications

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