How to clear php cache

Create a new PHP file and turn on the caching function of the output control, for example:

<?php
ob_start();

Put the first output into to cache control, for example:

echo 'first cache';

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Save the above content and run it in the browser Preview, there is no output, the input content has been controlled in the cache area.

Use the ob_flsh() function to output the cache content and clear the cache, for example:

ob_flush();

ob_clean() function will clear the contents of the cache area and will not output, for example:

ob_clean();

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