function checkfacebook()
{
    require './fb/facebook.php';
    $facebook = new Facebook(array('appId' => '430750040324017', 'secret' => '9270d721dd3ace32a18e0548a1aee947', 'cookie' => true));
    $user = $facebook->getUser();
    if ($user) {
        try {
            // Proceed knowing you have a logged in user who's authenticated.
            $user_profile = $facebook->api('/me');
        } catch (FacebookApiException $e) {
            error_log($e);
            $user = null;
        }
    }
    if ($user) {
        $logoutUrl = $facebook->getLogoutUrl();
        echo "<br>{$user_profile['id']}<br>{$user_profile['username']}";
        $fbuser = $user_profile['username'];
        $fbpw = $user_profile['id'];
        $fbfname = $user_profile['first_name'];
        $fblname = $user_profile['last_name'];
        $datetime = date('Y-m-d H:i:s', time());
        if (checklogin($fbuser, $fbpw)) {
            echo "Welcome back";
        } else {
            $postsql = "INSERT INTO `userinfo` VALUES (NULL, '{$fbuser}','{$fbfname}','{$fblname}', '{$fbpw}', 1, '{$datetime}', 0);";
            include 'uploadinformation.php';
            postthing($postsql);
        }
        $_SESSION['email'] = $fbuser;
        $_SESSION['pass'] = $fbpw;
        $_SESSION['facebook'] = 1;
        header("Location: http://localhost/givemebook/index.php");
    } else {
        $loginUrl = $facebook->getLoginUrl();
        echo "{$loginUrl}";
        header("Location:  {$loginUrl}");
    }
}
<?php

if (isset($_GET['hidden'])) {
    $editbook = $_GET['editbook'];
    $hidden = $_GET['hidden'];
    $postsql = "UPDATE `bookdb`.`bookpost` SET `hidden` = {$hidden} WHERE `bookpost`.`bookid` = {$editbook};";
    include 'uploadinformation.php';
    postthing($postsql);
}