通过 curl_error($ch)报如下错误:
SSL certificate problem: unable to get local issuer certificate
执行前设置CURLOPT_SSL_VERIFYPEER和CURLOPT_SSL_VERIFYHOST
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);