Delete the WordPress User When a Paid Memberships Pro Member Cancels His Account

gistfile1.php

/*
	Requires PMPro v1.4+
	Code to delete WP user accounts when a member cancels their PMPro account.
	Users are not deleted if:
	(1) They are not cancelling their membership (i.e. $level_id != 0)
	(2) They are an admin.
	(3) The level change was initiated from the WP Admin Dashboard 
	(e.g. when an admin changes a user's level via the edit user's page)
*/
function my_pmpro_after_change_membership_level($level_id, $user_id)
{
	//are they cancelling? and don't do this from admin (e.g. when admin's are changing levels)
	if(empty($level_id) && !is_admin())
	{
		//only delete non-admins
		if(!user_can($user_id, "manage_options"))
		{
			//remove the delete hooks so we don't try to cancel the membership again
			remove_action('delete_user', 'pmpro_delete_user');
			remove_action('wpmu_delete_user', 'pmpro_delete_user');
			
			//delete the user
			require_once(ABSPATH . "/wp-admin/includes/user.php");
			wp_delete_user($user_id);	
			
			//add the delete hooks back in
			add_action('delete_user', 'pmpro_delete_user');
			add_action('wpmu_delete_user', 'pmpro_delete_user');
		}
	}
}
add_action("pmpro_after_change_membership_level", "my_pmpro_after_change_membership_level", 10, 2);

This recipe is included in the blog post on "Delete the WordPress user when a PMPro member cancels" at Paid Memberships Pro here: https://www.paidmembershipspro.com/delete-the-wordpress-user-when-a-paid-memberships-pro-member-cancels-his-account/