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Using a plugin,I am looking a way to Show/Hide all Content after Headers are sent. If I have an authenticated user then show the content other wise redirect the user to authenticate first.

I want to use Facebook PHP SDK to authenticate the user. My questions are

  1. Using which Hook or Action I can put a check whether User is authenticated or Not.
  2. If user is authenticated, continue with WordPress Loop to show Content else Redirect to Facebook for Authentication.

A rough pseudo code is

After header if Facebook user Continue WordPress Loop else Redirect

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Do you want to check this before the page even loads up? Why do you want to redirect after headers are sent? – Rutwick Gangurde Nov 21 '11 at 3:18
Headers are sent by Facebook SDK and also a check before <Head> blocks Facebook to crawl Open Graph tags. In short, it can be checked right after <Body> at sometime before content Loads – Umair Bussi Nov 21 '11 at 14:18
Aha... I get it. Then try using loop_start action. It runs before the loop begins. – Rutwick Gangurde Nov 21 '11 at 14:24
Can you kindly elaborate the logic more? Suppose that i do this what would be the code to stop or continue the loop and also where would be the else check add_action('loop_start','myfunction') then function myfunction() {if ($user) //How do I Continue Loop else //How Do I Stop Loop } – Umair Bussi Nov 21 '11 at 14:38
Its an action, so you won't need to return anything. Just check if you're logged in, if not, then redirect to login / warning page, else continue. – Rutwick Gangurde Nov 21 '11 at 15:15

You can use this library located at Github.


  require './facebook.php';

   $facebook = new Facebook(array(
  'appId'  => 'YOUR APP ID',
  'secret' => 'YOUR API SECRET',
'cookie' => true, // enable optional cookie support

 if ($facebook->getSession()) {
} else {
   echo '<a href="' . $facebook->getLoginUrl() . '">Login</a>';
   ADD YOUR APP's 'Connect' button here.

Include facebook.php from the library located at Github (2nd line).

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