私はPHPとMySQLにまったく慣れていませんが、自分のWebサイトにFacebookPHPSDKを実装しています。これまでのところすべて正常に動作していますが、データベース（MySQL）にユーザーデータを追加するのに苦労しています。私が持っているものはすべて、usernameとoauth_uidの代わりに数字です（両方のフィールドで数字の5を取得します）。これはコードです：
<?php
define('db_user','myUserName');
define('db_password','myPassword');
define('db_host','myHost');
define('db_name','myDbName');
// Connect to MySQL
$dbc = @mysql_connect (db_host, db_user, db_password) OR die ('Could not connect to MySQL: ' . mysql_error() );
// Select the correct database
mysql_select_db (db_name) OR die ('Could not select the database: ' . mysql_error() );
require 'lib/facebook.php';
// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
'appId' => 'MYAPPID',
'secret' => 'MYSECRET',
'cookie' => true));
// Get User ID
$user = $facebook->getUser();
// We may or may not have this data based on whether the user is logged in.
//
// If we have a $user id here, it means we know the user is logged into
// Facebook, but we don't know if the access token is valid. An access
// token is invalid if the user logged out of Facebook.
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$fbuid = $facebook->getUser();
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}else{
header('Location: index.php');
}
$query = mysql_query("SELECT * FROM users WHERE oauth_provider = 'facebook' AND oauth_uid = ". $user['id']);
$result = mysql_fetch_array($query);
if(empty($result)){
$query = mysql_query("INSERT INTO users (oauth_provider, oauth_uid, username) VALUES ('facebook', {$user['id']}, '{$user['name']}')");
$query = msyql_query("SELECT * FROM users WHERE id = " . mysql_insert_id());
$result = mysql_fetch_array($query);
}
// Login or logout url will be needed depending on current user state.
if ($user) {
$paramsout = array('next'=>'http://www.mywebsite.com/test/logout.php');
$logoutUrl = $facebook->getLogoutUrl($paramsout);
}
?>
上記のページはuser_page.phpと呼ばれ、ログイン後にユーザーがリダイレクトされる場所です。「データベース」コードをindex.php（ユーザーがログインする場所）に移動しようとしましたが、これまでのすべての努力は失敗しました。これはindex.phpのコードです：
require 'lib/facebook.php';
// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
'appId' => 'MYAPPID',
'secret' => 'MYSECRET',
'cookie' => true));
// Get User ID
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$fbuid = $facebook->getUser();
$user_profile = $facebook->api('/me');
header('Location: user_page.php');
} catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}
// Login or logout url will be needed depending on current user state.
if ($user) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
$loginUrl = $facebook->getLoginUrl(Array('scope'=> 'user_interests,user_activities,user_education_history,user_likes,user_about_me, user_birthday, user_groups, user_hometown, user_work_history, email',
'redirect_uri' => 'http://www.mywebpage.com/test/user_page.php')
);
}
?>
更新*問題が修正されました（$userだけでなく$user_profile）：
$query = mysql_query("SELECT * FROM users WHERE oauth_provider = 'facebook' AND oauth_uid = ". $user_profile['id']);
$result = mysql_fetch_array($query);
if(empty($result)){
$query = mysql_query("INSERT INTO users (oauth_provider, oauth_uid, username) VALUES ('facebook', {$user_profile['id']}, '{$user_profile['name']}')");
$query = msyql_query("SELECT * FROM users WHERE id = " . mysql_insert_id());
$result = mysql_fetch_array($query);
}