What are some potential pitfalls of using browser caching in PHP web development?

Potential pitfalls of using browser caching in PHP web development include the risk of serving outdated content to users if the cache is not properly managed. To mitigate this issue, developers can set cache control headers to specify how long browsers should cache resources before checking for updates.

// Set cache control headers to prevent outdated content
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");