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Function Reference/register deactivation hook

The function register_deactivation_hook (introduced in WordPress 2.0) registers a plugin function to be run when the plugin is deactivated.

<?php register_deactivation_hook($file, $function); ?>

$file

(string) (required) Path to the main plugin file inside the wp-content/plugins directory. A full path will work.

Default: None

$function

(callback) (required) The function to be run when the plugin is deactivated. Any of PHP's callback pseudo-types will work.

Default: None

If you have a function called myplugin_deactivate() in the main plugin file at either

use this code:

register_deactivation_hook( __FILE__, 'myplugin_deactivate' );

This will call the myplugin_deactivate() function on deactivation of the plugin.