Recently I had to redirect users to the home page, and although I can do this with the 'Rules' module, I also wanted to add something to the $_SESSION for some custom code...

After a little digging I found this: http://api.drupal.org/api/drupal/modules!user!user.api.php/function/hook_user_login/7

/**
* Impliment hook_user_login().
*/
function YOURMODULENAME_user_login(&$edit, $account) {
    
  // Your logic will set $redirection to the desired location
  $redirection = 'node/1';
  
  // Unless there is already a redirection going, or the user is 
  // trying to reset his password, we redirect to $redirection.
  if (empty($_GET['destination'])
  && !is_null($redirection)
  && (!isset($_POST['form_id']) || $_POST['form_id'] != 'user_pass_reset')) {
    $_GET['destination'] = $redirection; // 
  }
}

This was done in a module, and it didn't take much to add an admin configuration page to allows the admin team to change the redirect...

Good Work! weboide