如何实现Facebook应用程序"像使用前一样"？

Question

许多Facebook应用程序在使用它之前会要求您"喜欢"它.怎么实现呢？它有特殊的API吗？

Answer 1

FBML页面已被弃用,您现在只能创建iframe粉丝页面.当用户导航到您的页面时,Facebook会发送您需要解码的signed_request参数. 本文将详细介绍如何执行此操作.

function parsePageSignedRequest() {
    if (isset($_REQUEST['signed_request'])) {
      $encoded_sig = null;
      $payload = null;
      list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2);
      $sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
      $data = json_decode(base64_decode(strtr($payload, '-_', '+/'), true));
      return $data;
    }
    return false;
}

if($signed_request = parsePageSignedRequest()) {
    if($signed_request->page->liked) {
      echo "This content is for Fans only!";
    } else {
      echo "Please click on the Like button to view this tab!";
    }
  }