Unable to retrieve and save user’s display picture through cURL - php

Question

I am trying to retrieve users display picture through graph api and using cUrl to save it into the disk, but am unable succeed in it and getting this error when trying to check the mime type of the picture that I saved:
Notice: exif_imagetype(): Read error! in
//$userPpicture = $user_profile[picture];
//Create image instances
$url = "http://graph.facebook.com/{$userId}/picture?type=large";
$dpImage = 'temp/' . $userId . '_dpImage_' . rand().'.jpg';
echo $dpImage;
function get_data($url) {
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
$returned_content = get_data($url);
file_put_contents($dpImage, $returned_content);
echo "Type: " . exif_imagetype($dpImage);
for this updated code using curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); I am getting this error:
Warning: curl_setopt(): CURLOPT_FOLLOWLOCATION cannot be activated when in safe_mode or an open_basedir is set in /var/fog/apps/app12345/myapp.phpfogapp.com/start.php on line 178
If this action requires any server side configuration then i might not be able to do this as am using a shared cloud storage over phpfog.
Kindly help me with this.
Thankyou.

Answer 1

The graph url you are using of http://graph.facebook.com/4/picture?type=large returns a HTTP 302 redirect, not the actual user image. You would need to follow the redirect and download the image at that url which is a url that looks like this: http://profile.ak.fbcdn.net/hprofile-ak-snc4/49942_4_1525300_n.jpg

Answer 2

As OffBySome points out, you need to follow the 302 redirect served by graph.facebook.com to the final destination, which contains the actual image data.
The simplest way to do that in this case is to add another curl_setopt call with CURLOPT_FOLLOWLOCATION as true. i.e.
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true)
Check out http://us3.php.net/manual/en/function.curl-setopt.php for more details.