PHP Not getting json using curl - php

Question

The main function is that one but I don't get any values, it works fine in a 000webhost domain but with a VPS I don't recieve any values.
(https://i.stack.imgur.com/uPVMV.png)
I have already installed php-curl and php-json, Am I missing some dependency?
Php Code
<?php
//Building A Simple Bittrex Bot
$apikey='2923c158d5754c29a088c4adea5c6f34';
$apisecret='3f29b39ab1be46afb0834fe56c8e4fea';
function bittrexbalance($apikey, $apisecret){
$nonce=time();
$uri='https://bittrex.com/api/v1.1/account/getbalance?apikey='.$apikey.'&currency=BTC&nonce='.$nonce;
$sign=hash_hmac('sha512',$uri,$apisecret);
$ch = curl_init($uri);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$execResult = curl_exec($ch);
$obj = json_decode($execResult, true);
$balance = $obj["result"]["Available"];
return $balance;
}
?>
Here is the link to code on the github.

Answer 1

The problem is obviously here:
$ch = curl_init($uri);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
$execResult = curl_exec($ch);
The documentation of curl_exec() clearly states:
Return Values
Returns TRUE on success or FALSE on failure. However, if the CURLOPT_RETURNTRANSFER option is set, it will return the result on success, FALSE on failure.
Add a call to curl_setopt() passing CURLOPT_RETURNTRANSFER to let curl_exec() know you want it to return and not to display the body of the HTTP response.
$ch = curl_init($uri);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$execResult = curl_exec($ch);