如何使用php/javascript检查用户是否喜欢该页面

问题描述

我想已经有很多人问过这个问题，但是我仍然需要一个解决方案来检查登录用户是否喜欢该页面.我尝试了很多解决方案，但没有一个主题在起作用.

I think so many people have been asked this quesion,But still I need a solution to check whether logined user has liked the page or not.I have tried so many solutions but none of theme were working.

我尝试使用以下代码

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!";
  }
}

我无法获得用户喜欢"的回复.因此，任何人都可以指导我如何做才能使用户获得喜欢"的响应.

I could not get the user "liked" response. So any can instruct me how what should I do to get the user "liked" response.

推荐答案

function parse_signed_request($signed_request, $secret)
{
  list($encoded_sig, $payload) = explode('.', $signed_request, 2);

  // decode the data
  $sig = base64_url_decode($encoded_sig);
  $data = json_decode(base64_url_decode($payload), true);

  if(strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
    $error['signed_request'] = 'Unknown algorithm. Expected HMAC-SHA256';
    return null;
  }

  // check sig
  $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
  if($sig !== $expected_sig) {
    $error['bad_signed_json'] = 'Bad Signed JSON signature!';
    return null;
  }

  return $data;
}

function base64_url_decode($input) {
  return base64_decode(strtr($input, '-_', '+/'));
}

$signed_request_data = parse_signed_request($_REQUEST['signed_request'],$fb_app_secret);

if($signed_request_data['page']['liked']) {
  print "Content for Useres who have liked your page...";
}

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