How can PHP caching mechanisms impact the dynamic nature of PHP web pages?

PHP caching mechanisms can impact the dynamic nature of PHP web pages by storing previously generated content and serving it to users without re-executing the PHP code. This can lead to outdated or incorrect information being displayed to users. To ensure the dynamic nature of PHP web pages is maintained, developers should configure caching mechanisms to expire content after a certain period or when changes are made to the underlying data.

// Example code snippet to set a cache expiration time of 1 hour
header("Cache-Control: max-age=3600");