Different links for authenticated and anonymous users in Drupal: drupal_goto

The drupal_goto() drupal function (all 4.x-7.x) can be useful in many situations, here a simple example to place in your template.php theme file.

function conditional_user_goto() {
	$output = '';
	global $user;
	if (in_array('authenticated user', array_values($user->roles))) {
		$path = 'user/' . $user->uid . '/some/user/based/link';
		drupal_goto($path);
	}
	else {
		$output = t('<a href="@login">Login</a> or <a href="@register">register</a> to Some User Based Action.',
            array('@login' => url('user/login', 'destination=alerting'),
            '@register' => url('user/register', 'destination=alerting')));
	}
	return $output;
}

Using print conditional_user_goto(); somewhere in your code (e.g. within a PHP block) will display a link to some user page (e.g. user page itself, tracks or subscription interface) to authenticated users, and a translatable “Login or register” message to anonymous users (I take this code from Job Posting module).