[php]通过http post发送json数据

   function http_post_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($return_code, $return_content);    }$url  = "http://xx.xx.cn";$data = json_encode(array('a'=>1, 'b'=>2)); list($return_code, $return_content) = http_post_data($url, $data);