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The delete_user action/hook can be used to perform additional actions when a user is deleted. For example, you can delete rows from custom tables created by a plugin.
The hook passes one parameter: the user's ID.
This hook runs before a user is deleted. The hook deleted_user (notice the "ed") runs after a user is deleted. Choose the appropriate hook for your needs. If you need access to user meta or fields from the user table, use delete_user.
User's deleted from Network Site installs may not trigger this hook. Be sure to use the wpmu_delete_user hook for those cases.
<?php add_action( 'delete_user', 'function_name' ); ?>
where "function_name" is the name of the function to be called.
Let's have a look at an example:
function my_delete_user($user_id) {
global $wpdb;
$email = $wpdb->get_var("SELECT user_email FROM $wpdb->users WHERE ID = '" . $user_id . "' LIMIT 1");
$headers = 'From: ' . get_bloginfo("name") . ' <' . get_bloginfo("admin_email") . '>' . "\r\n";
wp_mail($email, 'You are being deleted, brah', 'Your account at ' . get_bloginfo("name") . ' is being deleted right now.', $headers);
}
add_action( 'delete_user', 'my_delete_user');
In this example we send a friendly message to a user before their account is deleted a few milliseconds later.
