What are the implications of disabling caching in the header of PHP generated images for performance and user experience?

Disabling caching in the header of PHP generated images can lead to slower loading times and increased server load as the images will need to be regenerated each time they are requested. This can result in a poor user experience due to longer wait times for the images to load. To improve performance and user experience, it is recommended to enable caching for PHP generated images by setting appropriate cache-control headers.

// Set cache control headers to enable caching for PHP generated images
header("Cache-Control: max-age=3600, public");
header("Expires: " . gmdate('D, d M Y H:i:s', time() + 3600) . ' GMT');