Post Json with cURL
<?php
$data = array("name" => "Hagrid", "age" => "36");
$data_string = json_encode($data);
$ch = curl_init('http://api.plemi.lan/app_dev.php/demand');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',
'Content-Length: ' . strlen($data_string)) );
$result = curl_exec($ch);
var_dump($result);