Facebook Graph API PHP 5.0 - 500 getLoginUrl（）のエラー

Question

私はFacebook Graph APIに接続し、最終的にFacebookページに投稿するために使用されるWordPressプラグインを構築しています。私は自分のドキュメントに従っているし、 "Facebookでログイン"をクリックすると、500サーバーのエラーが発生しています。コード= "トークン"がURLに戻ってきますが、サーバーのエラーは500です。

私が実行しています。..

• PHP：私はFB-callback.phpファイルからすべてを取るとちょうどエコーそれは作業」をした場合5.4
• のmbstringが

を有効になっていますページに表示され、何も壊れませんが、私はちょうどその下に接続するFacebookを持っているときに壊れて...と私は500のエラーを取得します。

$fb = new Facebook\Facebook([ 
    'app_id' => 'my-secret', 
    'app_secret' => 'my-id', 
    'default_graph_version' => 'v2.8', 
    ]); 

以下はコードの残りの部分です。これはWordPress Pluginであり、私が開発している最初のものなので、組織内で少し混乱していると確信しています。あなたは、FB-の先頭にsession_start()を呼び出す必要が

<?php 
    session_start(); 
    $fb = new Facebook\Facebook([ 
     'app_id' => 'my-id', 
     'app_secret' => 'my-secret', 
     'default_graph_version' => 'v2.8', 
    ]); 

    $helper = $fb->getRedirectLoginHelper(); 

    $permissions = ['email', 'manage_pages', 'publish_pages', 'user_posts']; // Optional permissions 

    $loginUrl = $helper->getLoginUrl('http://p11socialplugin.p11.com/wp-content/plugins/p11-social/fb-callback.php', $permissions); 

    echo '<a href="' . htmlspecialchars($loginUrl) . '">Log in with Facebook!</a>'; 

    ?> 

ここで全体のFB-callback.php

<?php 
$fb = new Facebook\Facebook([ 
    'app_id' => 'my-app-id ', // Replace {app-id} with your app id 
    'app_secret' => 'my-app-secret', 
    'default_graph_version' => 'v2.8', 
    ]); 

$helper = $fb->getRedirectLoginHelper(); 

try { 
    $accessToken = $helper->getAccessToken(); 
} catch(Facebook\Exceptions\FacebookResponseException $e) { 
    // When Graph returns an error 
    echo 'Graph returned an error: ' . $e->getMessage(); 
    exit; 
} catch(Facebook\Exceptions\FacebookSDKException $e) { 
    // When validation fails or other local issues 
    echo 'Facebook SDK returned an error: ' . $e->getMessage(); 
    exit; 
} 

if (! isset($accessToken)) { 
    if ($helper->getError()) { 
    header('HTTP/1.0 401 Unauthorized'); 
    echo "Error: " . $helper->getError() . "\n"; 
    echo "Error Code: " . $helper->getErrorCode() . "\n"; 
    echo "Error Reason: " . $helper->getErrorReason() . "\n"; 
    echo "Error Description: " . $helper->getErrorDescription() . "\n"; 
    } else { 
    header('HTTP/1.0 400 Bad Request'); 
    echo 'Bad request'; 
    } 
    exit; 
} 

// Logged in 
echo '<h3>Access Token</h3>'; 
var_dump($accessToken->getValue()); 

// The OAuth 2.0 client handler helps us manage access tokens 
$oAuth2Client = $fb->getOAuth2Client(); 

// Get the access token metadata from /debug_token 
$tokenMetadata = $oAuth2Client->debugToken($accessToken); 
echo '<h3>Metadata</h3>'; 
var_dump($tokenMetadata); 

// Validation (these will throw FacebookSDKException's when they fail) 
$tokenMetadata->validateAppId({app-id}); // Replace {app-id} with your app id 
// If you know the user ID this access token belongs to, you can validate it here 
//$tokenMetadata->validateUserId('123'); 
$tokenMetadata->validateExpiration(); 

if (! $accessToken->isLongLived()) { 
    // Exchanges a short-lived access token for a long-lived one 
    try { 
    $accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken); 
    } catch (Facebook\Exceptions\FacebookSDKException $e) { 
    echo "<p>Error getting long-lived access token: " . $helper->getMessage() . "</p>\n\n"; 
    exit; 
    } 

    echo '<h3>Long-lived</h3>'; 
    var_dump($accessToken->getValue()); 
} 

$_SESSION['fb_access_token'] = (string) $accessToken; 

// User is logged in with a long-lived access token. 
// You can redirect them to a members-only page. 
//header('Location: https://p11socialplugin.p11.com/wp-admin'); 

?> 

エラーログ

ある

[30-Jan-2017 22:03:28 UTC] PHP Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /Users/garrett/Development/wp-playground/wp-content/themes/twentyseventeen/header.php:16) in /Users/garrett/Development/wp-playground/wp-content/themes/twentyseventeen/facebook.php on line 2 
    [30-Jan-2017 22:03:28 UTC] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /Users/garrett/Development/wp-playground/wp-content/themes/twentyseventeen/header.php:16) in /Users/garrett/Development/wp-playground/wp-content/themes/twentyseventeen/facebook.php on line 2 
    [30-Jan-2017 22:03:58 UTC] PHP Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /Users/garrett/Development/wp-playground/wp-admin/includes/template.php:1995) in /Users/garrett/Development/wp-playground/wp-content/plugins/p11-social/class.p11-social.php on line 103 
    [30-Jan-2017 22:03:58 UTC] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /Users/garrett/Development/wp-playground/wp-admin/includes/template.php:1995) in /Users/garrett/Development/wp-playground/wp-content/plugins/p11-social/class.p11-social.php on line 103 
    [30-Jan-2017 22:04:08 UTC] PHP Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /Users/garrett/Development/wp-playground/wp-admin/includes/template.php:1995) in /Users/garrett/Development/wp-playground/wp-content/plugins/p11-social/class.p11-social.php on line 103 
    [30-Jan-2017 22:04:08 UTC] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /Users/garrett/Development/wp-playground/wp-admin/includes/template.php:1995) in /Users/garrett/Development/wp-playground/wp-content/plugins/p11-social/class.p11-social.php on line 103 

Answer 1

：

設定ページは、 callback.phpも同様です。

また、Facebook \ Facebookコンストラクタの追加引数を'persistent_data_handler' => 'session'に渡す必要があります。そうしないと、CSRF例外が発生します。

new Facebook([ 
     'app_id' => '{app-id}', 
     'app_secret' => '{app-secret-key}', 
     'default_graph_version' => 'v2.8', 
     'persistent_data_handler'=> 'session' 
    ]);