HTTP REQUEST in curl - php

Question

how can I make an HTTP REQUEST in curl with json?
I need to put this in curl for php:
POST /api/ra/v1/ping HTTP/1.0
Host: app.kigo.net
Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=
Content-Type: application/json
{
"PING" : "PONG"
}
Thanks in advance!
EDIT
This is what I've tried, but it shows "Invalid Content-Type header.":
<?php
$url = 'https://app.kigo.net/api/ra/v1/ping';
$headers = array( 'Authorization' => 'Basic dXNlcm5hbWU6cGFzc3dvcmQ=', 'Content-Type' => 'application/json' );
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch,CURLOPT_POSTFIELDS, "PING=PONG");
$result = curl_exec($ch);
curl_close($ch);
print_r( $result );
?>

Answer 1

Your CURLOPT_HTTPHEADER array must be in the form array('Header1: value1', 'Header2: value2') and not array('Header1' => 'value1', 'Header2' => 'value2'), see examples in http://php.net/manual/en/function.curl-setopt.php
Also, if you post JSON data, you should probably json_encode() the data you are sending.
$headers = array(
'Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=',
'Content-Type: application/json'
);
$postData = json_encode(array(
'PING' => 'PONG'
));
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, 'https://app.kigo.net/api/ra/v1/ping');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch,CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);