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我正在尝试制作一个简单的 fangate Facebook 应用程序，但我被卡住了。该页面根本不为t show - it空白。我在互联网上找到了一个代码并实现了它（也从 github 下载了 facebook sdk） Facebook 页面 URL（http）和安全（https）是正确的。如果我链接 index.php 页面是空白的，如果我链接 prelike.php 或reveal.php 显示内容。有谁知道问题可能出在哪里？链接到 Facebook 应用程序： https ://www.facebook.com/pages/Testna-stran/136388943218474?id=136388943218474&sk=app_744205652262463

<?php
require 'facebook.php';

$app_id = "xxxxxxxxxxxxxx";
$app_secret = "xxxxxxxxxxxxxxxxxxx";
$facebook = new Facebook(array(
    'appId' => $app_id,
    'secret' => $app_secret,
    'cookie' => true
));


$signed_request = $facebook->getSignedRequest();

$page_id = $signed_request["page"]["id"];
$page_admin = $signed_request["page"]["admin"];
$like_status = $signed_request["page"]["liked"];
$country = $signed_request["user"]["country"];
$locale = $signed_request["user"]["locale"];

// The following statement does a test of $like_status and chooses which page to     display to the visitor
if ($like_status) {$a = file_get_contents("reveal.php");
echo ($a);
}
else {$a = file_get_contents("prelike.php");
echo ($a);
}

?>
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