PHP ends or breaks randomly using Facebook API - php

Question

I'm using the Facebook openGraph API for PHP. Here is my code:
<?php
session_start();
if (!isset($_SESSION['username'])) {
header("Location: index.php");
break;
}
$fbconfig['appid' ] = "APPID";
$fbconfig['secret'] = "SECRET";
$fbconfig['baseurl'] = "http://blah.com/";
$user = null;
try{
include_once "facebook.php";
}
catch(Exception $o){
error_log($o);
}
// Create our Application instance.
try {
$facebook = new Facebook(array(
'appId' => $fbconfig['appid'],
'secret' => $fbconfig['secret'],
'cookie' => true,
));
} catch (Exception $e) { echo "ERROR: ".$e; }
$user = $facebook->getUser();
$loginUrl = $facebook->getLoginUrl(
array(
'scope' => 'email,publish_stream,read_stream,user_birthday,user_location,user_work_history,user_about_me,user_hometown',
'redirect_uri' => $fbconfig['baseurl'].'blah.php'
)
);
$logoutUrl = $facebook->getLogoutUrl(array( 'next' => ($fbconfig['baseurl'].'blah.php') ));
//if user is logged in and session is valid.
if ($user ){
header("Location;$loginUrl");
break;
}
?>
Now, this works on other pages (the Facebook part) but on this page only (same dir as other pages) The browser thinks that the PHP ends at "'appId' =>" and from then on interprets it as html. So I get this in my browser:
http://cl.ly/image/1y2a2F0e3I35
Sorry for the weird cropped picture, but I can't divulge the name or intent of the business.
There is HTML after the PHP on the real site and I can give this + js if needed.
Thank you!

Answer 1

your header is wrong.......try following......
header("Location:$loginUrl");
and also if you don't get facebook user id then you have to redirect to login page but you did reverse.may do following
//if user is not loggin
if (empty($user)){
header("Location:$loginUrl");
}else{
try {
$userInfo = $facebook->api("/$user");
} catch (FacebookApiException $e) {
$userInfo=null;
}
}