What are some common browser caching issues that can affect PHP websites and how can they be resolved or worked around?

One common caching issue is when a browser caches outdated resources, leading to users seeing old versions of a website. This can be resolved by setting proper cache control headers in PHP to control how long browsers should cache resources. By setting the cache control headers to expire after a certain time, browsers will be forced to fetch the latest version of the resources. 

// Set cache control headers to expire after 1 hour
header("Cache-Control: max-age=3600, must-revalidate");

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Browser caching PHP websites caching issues resolution workaround

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