php - How to fix curl_exec returns false -

i developing payment php weixin. code implemented follow. curl_exec return false ,

    $ch = curl_init();     curl_setopt($ch, curlopt_timeout, $second);     if(wxpayconfig::curl_proxy_host != "0.0.0.0"         && wxpayconfig::curl_proxy_port != 0){         curl_setopt($ch,curlopt_proxy, wxpayconfig::curl_proxy_host);         curl_setopt($ch,curlopt_proxyport, wxpayconfig::curl_proxy_port);     }     curl_setopt($ch,curlopt_url, $url);     curl_setopt($ch,curlopt_ssl_verifypeer,true);     curl_setopt($ch,curlopt_ssl_verifyhost,2);      curl_setopt($ch, curlopt_header, false);      curl_setopt($ch, curlopt_returntransfer, true);      if($usecert == true){         curl_setopt($ch,curlopt_sslcerttype,'pem');         curl_setopt($ch,curlopt_sslcert, wxpayconfig::sslcert_path);         curl_setopt($ch,curlopt_sslkeytype,'pem');         curl_setopt($ch,curlopt_sslkey, wxpayconfig::sslkey_path);     }      curl_setopt($ch, curlopt_post, true);     curl_setopt($ch, curlopt_postfields, $xml);      $data = curl_exec($ch); 

i catch error message of curl_exec , message following.

"ssl certificate problem, verify ca cert ok. details: error:14090086:ssl routines:ssl3_get_server_certificate:certificate verify failed"

this because of "curl_setopt($ch,curlopt_ssl_verifypeer,true);"

you should set "curl_setopt($ch,curlopt_ssl_verifypeer,false);".