PHP CURL 提交Json数据

<?php 
/*
 * PHP CURL 提交Json数据
 * @access json_curl.php
 * @create 2012-09-28
 */


$data = array("name" => "Larry", "age" => "25");
$data_string = json_encode($data);


$ch = curl_init('http://api.local/rest/users');
curl_setopt($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)));
curl_exec($ch);