Not able to retrieve any data from graph API - php

Question

Hello I am using the below code section. For back ground, last time was working I was getting Curl Exception 77 due to ssl related issues. Still HTTPS is not enabled at my domain yet. With this little info. I am pasting the code section below. There are some prints that I am using for my debugging. (I am new to PHP, kindly bear with me)
<?php
include_once('./php-sdk/facebook.php');
include_once('./php-sdk/fbhelper.php');
$config = array(
'appId' => FACEBOOK_APP_ID,
'secret' => FACEBOOK_SECRET,
);
try {
$facebook = new Facebook($config);
}
catch (FacebookApiException $e) {
echo 'Excetption is' . $e->__toString();
}
?>
<?php
$user_id = $facebook->getUser();
if ($user_id) {
echo "user exists and is: " .$user_id;
} else {
echo "user DONT exists";
}
// If i comment out this next try catch block for $session, then my page renders
// fine, but when I am using this code block, then my page doesn't render beyond
// this code section. This is very strange. Why not an exception is thrown if there
// are any issues? Can anybody help me understand this?
try {
$session = $facebook->getSession();
if ($session) {
echo "user exists and is: " . $session;
} else {
echo "user DONT exists";
}
} catch (FacebookApiException $e) {
print_r($e);
}
// now when I comment out above $session related part, then page renders fine, but
// no where any prints show me anything. Why the name is not getting reflected?
if ($user_id) {
try {
$user_profile = $facebook->api('/727850431', 'GET');
echo 'Name: ' . $user_profile['name'];
} catch (FacebookApiException $e) {
print_r($e);
$login_url = $facebook->getLoginUrl();
echo 'Please login.';
}
} else {
$login_url = $facebook->getLoginUrl();
echo 'Please login.';
}
try {
$url = 'https://graph.facebook.com/oauth/access_token?client_id=FACEBOOK_APP_ID&client_secret=FACEBOOK_SECRET& grant_type=client_credentials';
$app_access_token = json_decode(file_get_contents($url));
$graph_url = "https://graph.facebook.com/me?access_token=" . $app_access_token;
$result = json_decode(file_get_contents($graph_url));
print_r($result);
} catch (FacebookApiException $e) {
print_r($e);
}
?>