php curl header information addition request header

  $header  = array(
            'x-api-key:'.'b8602c0361111415a221759cdeb9e636',
            'Content-Type:'.'application/x-www-form-urlencoded; charset=UTF-8'
        );

　　

    /**
     * @param $url
     * @param null $data
     * @return bool|string
     */
    public function http_request($url, $data = null, $header = null){

        $curl = curl_init();
        if(!empty($header)){
            curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
            curl_setopt($curl, CURLOPT_HEADER, 0);//返回response头部信息
        }

        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        if (!empty($data)) {
            curl_setopt($curl, CURLOPT_HTTPGET, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS,http_build_query($data));
        }

        curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }