🥇 PHP Facebook Like Gate

Aqui está uma função PHP simples para criar uma página condicional com base no fato de o usuário gostar ou não da página do Facebook. Além disso, ele usa o javascript SDK para redimensionar dinamicamente a tela para a largura e altura desejadas do conteúdo da página.

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Site Name</title>
<meta property="og:title" content=""/>
<meta property="og:type" content="sport"/>
<meta property="og:url" content="http://site.com"/>
<meta property="og:image" content="/images/appLogo.jpg"/>
<meta property="og:site_name" content="Site Name"/>
<meta property="fb:admins" content="USER_ID"/>
<meta property="og:description" content="Description."/>
<meta property="fb:app_id" content="APP ID"/>

<link rel="stylesheet" href="styles/site.css" type="text/css" />
</head>

<body style="">
<div id="fb-root"></div>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script>
  FB.init({
    appId  : '123456789', // unique app ID for tab application. This will need to be updated for live app.
    status : true, // check login status
    cookie : true, // enable cookies to allow the server to access the session
    xfbml  : true, // parse XFBML
    oauth  : true // enable OAuth 2.0
  });

</script>

<?php
function parse_signed_request($signed_request) {
  list($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_log('Unknown algorithm. Expected HMAC-SHA256');
    return null;
  }

  return $data;
}

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


  if($signed_request = parse_signed_request($_REQUEST['signed_request'])) {
    //print_r($signed_request);
    //print_r($_REQUEST['signed_request']);
    if($signed_request["page"]["liked"]) {
?>
<script type="text/javascript">
        FB.Canvas.setSize({ width: 520, height: 1250 }); // Set to the correct height of your page content.
</script>
<div id="like">
   You liked this.
</div>
<?php
    } else {
?>
<script type="text/javascript">
        FB.Canvas.setSize({ width: 520, height: 530 }); // Set to the correct height of your page content.
</script>
<div id="preLike">
      Like this page.
</div>
<?php
    }
  }
  else {
?>
No signed_request. I am broken.

<?php
  }
  ?>
</body>
</html>

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