Codeigniter：从视图页面重定向到另一个URL

Question

google-php-client example calls the authorization URL when user clicks a link. I want to call it when page loads without any user click. The way it is implemented in google-client example:

$client = new Google_Client();
$client->setApplicationName('Google Contacts PHP Sample');
$client->setScopes("http://www.google.com/m8/feeds/");
$auth = $client->createAuthUrl();
print "<a class=login href='$auth'>Connect Me!</a>";

I am trying to remove dependency on clicking on Connect Me link and call url given by $client->createAuthUrl(). I am new to Codeigniter that's why struggling on this simple task.
I check that there are following different ways to call an URL but not sure which one will work here:

1. cURL
2. file_get_contents
3. stream_context_create

I am using php 5.3 with XAMPP

Answer 1

For a simple redirect using CodeIgniter's libraries, use the following:

$client = new Google_Client();
$client->setApplicationName('Google Contacts PHP Sample');
$client->setScopes("http://www.google.com/m8/feeds/");
$auth = $client->createAuthUrl();

$this->load->helper('url');
redirect($auth); // Returns a HTTP redirect to the client

This is a wrapper around header('Location: ... '); when no second parameter is passed (or is passed as 'location').