cURL post

gistfile1.php

<?php
$data['var'] = urlencode($_POST['var']);

$ch = curl_init();
$url = 'API_URL';

//set the url, number of POST vars, POST data
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, count($data));
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data, '', '&'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

//execute post
$result = curl_exec($ch);

//close connection
curl_close($ch);