php - Why is cURL exec also returning the header data of my POST request?

Question

I'm just testing some code for image compression and then uploading to the Imgur API. But instead of just getting the response content I seem to be getting the header data as well and I can't figure out how to just parse the JSON. Here's what I have so far:

compress_test.php

include("imgur_upload.php");
echo compress_and_upload();

imgur_upload.php

function compress_and_upload(){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://api.imgur.com/3/image.json');
    curl_setopt($ch, CURLOPT_POST, TRUE);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // for localhost
    curl_setopt($ch, CURLOPT_HEADER, FALSE); // tried this but no change
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Client-ID ' . IMGUR_CLIENT_ID));
    curl_setopt($ch, CURLOPT_POSTFIELDS, array('image' => 'http://userserve-ak.last.fm/serve/300x300/51654499.png', 'type' => 'url'));

    $reply = curl_exec($ch);
    curl_close($ch);
    return $reply;
}

What I'm expecting to be echoed is just the JSON data I believe.

Here is what I'm getting:

BHTTP/1.1 200 OK
Server: nginx
Date: Sat, 03 Aug 2013 05:14:53 GMT
Content-Type: application/json
Content-Length: 325
Connection: keep-alive
Set-Cookie: IMGURSESSION=dhjtli4c84koo2jbr8lild7ji7; path=/; domain=.imgur.com
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Pragma: no-cache
Set-Cookie: _nc=1; path=/; domain=.imgur.com; httponly
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS
Access-Control-Allow-Headers: Authorization, Content-Type, Accept, X-Mashape-Authorization
X-RateLimit-ClientLimit: 12500
X-RateLimit-ClientRemaining: 12473
X-RateLimit-UserLimit: 500
X-RateLimit-UserRemaining: 497
X-RateLimit-UserReset: 1375510414
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Set-Cookie: UPSERVERID=i-614a2006; path=/
Accept-Ranges: bytes
X-Imgur-Cached: 0

{"data":{"id":"HE981gx","title":null,"description":null,"datetime":1375506893,"type":"image\/png","animated":false,"width":300,"height":300,"size":458117,"views":0,"bandwidth":0,"favorite":false,"nsfw":null,"section":null,"deletehash":"qkl9lNDWCRR52Z0","link":"http:\/\/i.imgur.com\/HE981gx.png"},"success":true,"status":200}°