php - How can I retrieve all google Contacts with the Contacts API?

I'm trying to use the Contacts API to retrieve all the contacts of the person who clicks on the at the bottom of response-callback.php. I am using Google App Engine and within the GAE I enabled the Contacts API. I got this code by following a tutorial so it's rather hard to find errors myself. I haven't worked with either PHP or GAE or any API. This also why I can't debug and check if certain values are empty are not.

When I start the website up. I doesn't show anything. Not even the echo I am using to test if I can reach the response-callback.php nor the H2 is showing I just get a completely white page.

app.yaml:

application: csimporttest
version: 1
runtime: php55
api_version: 1
threadsafe: yes

handlers:

- url: /
  script: main.php;

main.php:

Hi! Stackoverflow!
echo "response-callback file: " $test; 
?>

response-callback.php:

session_start();

require_once 'google-api-php-client/src/autoload.php';

$test = 'WORKS!'; 


$google_client_id = 'SECRET';
$google_client_secret = 'SECRET';
$google_redirect_uri = 'SECRET';

//setup new google client
$client = new Google_Client();
$client -> setApplicationName('csimporttest');
$client -> setClientid($google_client_id);
$client -> setClientSecret($google_client_secret);
$client -> setRedirectUri($google_redirect_uri);

$client -> setAccessType('online');

$client -> setScopes('https://www.googleapis.com/auth/contacts.readonly');

$googleImportUrl = $client -> createAuthUrl();
function curl($url, $post = "") {
 $curl = curl_init();
 $userAgent = 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)';
 curl_setopt($curl, CURLOPT_URL, $url);
 //The URL to fetch. This can also be set when initializing a session with curl_init().

 curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
 //TRUE to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.
 curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 5);
 //The number of seconds to wait while trying to connect.
 if ($post != "") {
 curl_setopt($curl, CURLOPT_POST, 5);
 curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
 }
 curl_setopt($curl, CURLOPT_USERAGENT, $userAgent);
 //The contents of the "User-Agent: " header to be used in a HTTP request.

 curl_setopt($curl, CURLOPT_FOLLOWLOCATION, TRUE);
 //To follow any "Location: " header that the server sends as part of the HTTP header.
 curl_setopt($curl, CURLOPT_AUTOREFERER, TRUE);
 //To automatically set the Referer: field in requests where it follows a Location: redirect.
 curl_setopt($curl, CURLOPT_TIMEOUT, 10);
 //The maximum number of seconds to allow cURL functions to execute.
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
 //To stop cURL from verifying the peer's certificate.
 $contents = curl_exec($curl);
 curl_close($curl);

 return $contents;
}
if(isset($_SESSION['google_code'])) {
 $auth_code = $_SESSION['google_code'];
 $max_results = 200;
    $fields=array(
        'code'=>  urlencode($auth_code),
        'client_id'=>  urlencode($google_client_id),
        'client_secret'=>  urlencode($google_client_secret),
        'redirect_uri'=>  urlencode($google_redirect_uri),

        'grant_type'=>  urlencode('authorization_code')
    );
    $post = '';
    foreach($fields as $key=>$value)
    {
        $post .= $key.'='.$value.'&';
    }
    $post = rtrim($post,'&');
    $result = curl('https://www.googleapis.com/oauth2/v4/token',$post);
    $response =  json_decode($result);

    $accesstoken = $response->access_token;
    $url = 'https://www.google.com/m8/feeds/contacts/default/full?max-results='.$max_results.'&alt=json&v=3.0&oauth_token='.$accesstoken;
    $xmlresponse =  curl($url);
    $contacts = json_decode($xmlresponse,true);

 $return = array();
 if (!empty($contacts['feed']['entry'])) {
 foreach($contacts['feed']['entry'] as $contact) {
           //retrieve Name and email address  
 $return[] = array (

 'name'=> $contact['title']['$t'],
 'email' => $contact['gd$email'][0]['address'],
 );
 } 
 }

 $google_contacts = $return;

 unset($_SESSION['google_code']);


}
?>
 Import google contacts 

Answer

You can use an var_dump() to see if the array google_contacts is actually filled. Put this in the main.php:

 var_dump($google_contacts);
?>

If you get an output in the var_dump you can use an html table and an easy foreach, look below:

foreach ($google_contacts as $contacts){
    echo'';
    echo'";
    echo'';
    echo'';
}
?>



    
Naam 
    
Email 
'. $contacts['name']."
'. $contacts['email'].'