WordPress Development Quick Start Guide

Uninstalling the plugin to clean the resources

There's a big difference between deactivating and uninstalling a plugin. Cleaning resources should only be done upon deactivation. WordPress provides two methods for implementing the uninstallation process. The first method is using a built-in function called register_uninstall_hook to handle the uninstall process. This works similar to the technique we used in activation, through a callback function. The second method is using a file called uninstall.php inside the root folder of the plugin. In this plugin, we are going to use the latter technique with the uninstall.php file.

You can view more details about the other technique at https://developer.wordpress.org/reference/functions/register_uninstall_hook/ ...