Drupal hook_user_update is not working

Question

I want the last updated time of the user profile details. So i have created a table user_changes with fields ( id, uid, changed ). When i use this hook_user_update hook , then data is not inserted into the table. I'm using this function in my theme's template.php

function garland_user_update(&$edit, $account, $category) {
    db_insert('user_changes')->fields(array(
    'uid' => $account->uid,
    'changed' => time(),
    ))->execute();
    exit; 
}

Let me know if you want any details. Thanks in advance.

Answer 1

Hooks must be implemented in modules, not in themes. For that, choose a name (e.g. example), create a directory by that name in sites/all/modules, create the example.info file with content

name = Example
description = Does some fancy stuff in certain situations
core = 7.x

in that directory and put your function in sites/all/modules/example/example.module. You also have to rename your function to example_user_update.

Further reading:

• Writing module .info files (Drupal 7.x)
• Understanding the hook system for Drupal modules
• module_invoke_all, the function that is used to invoke hook implementations.