All Code

<?php
require '../src/facebook.php';
$facebook = new Facebook(array(
  'appId'  => '339554932739410',
  'secret' => 'xxxxxxxxxxx',
));

$pages = $facebook->api('/me/accounts');

foreach ($pages['data'] as $page) {
    if($page['id']==171360273518){
        $page_access_token = $page['access_token'];
        $page_conversations = $facebook->api('/'.$page['id'].'/conversations', 'GET', array('access_token' => $page_access_token));
        echo "<pre>";
        var_dump($page_conversations);
        echo "</pre>";
    }else{
        echo "Youre not admin";
    }
}