利用 CURL 發送JSON格式字符串

/*
     * post 發送JSON 格式數據
     * @param $url string URL
     * @param $data_string string 請求的具體內容
     * @return array
     *      code 狀態碼
     *      result 返回結果
     */
    function post_json_data($url, $data_string) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
                'Content-Type: application/json; charset=utf-8',
                'Content-Length: ' . strlen($data_string))
        );
        ob_start();
        curl_exec($ch);
        $return_content = ob_get_contents();
        ob_end_clean();
        $return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        return array('code'=>$return_code, 'result'=>$return_content);
    }

 $arr = array('a'=>'555','b'=>56454564);
dump(post_json_data('http://192.168.211.1/html/dump.php',json_encode($arr)));

注意：接收數據的時候不是用 $_POST,而是

$content = file_get_contents('php://input');