PHP中使用raw格式发送POST请求

function http_post($url, $data_string) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'X-AjaxPro-Method:ShowList',
            'Content-Type: application/json; charset=utf-8',
            'Content-Length: ' . strlen($data_string))
        );
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        $data = curl_exec($ch);
        curl_close($ch);
        return json_decode($data, true);
    }