title: About the like_status with PHP programming
body: <p>When I try to use <code>['signed_request']</code> in PHP, I can't get <code>[page][liked] / Page ID</code> value. 
  I only can get <code>[algorithm]</code>, <code>[issued_at]</code>, <code>[user]</code>, <code>[country]</code>, <code>[locale]</code>, <code>[age]</code> values from <code>['signed_request']</code>.</p>
  
  <p>I have created "users_like" Permission in the App's Auth Dialog page. I have set up a Canvas page.</p>
  
  <p>Please help me find out the problem and solution.</p>
  
  <p>P.S. I want to set up  a landing page which can check the user whether like it or not.</p>