curl json方式提交

function assistant_request($url , $params = array()){
        $data_string = json_encode($params,JSON_UNESCAPED_UNICODE);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        curl_setopt(
            $ch, CURLOPT_HTTPHEADER,
            array(
                'Content-Type: application/json'
            )
        );

        $data = curl_exec($ch);
        curl_close($ch);
        return ($data);
    }