php 使用curl 代理访问报错：Operation timed out after 0 milliseconds with 0 out of 0 bytes received

对应的curl代码如下：
出现报错Operation timed out after 0 milliseconds with 0 out of 0 bytes received

$ch = curl_init();
curl_setopt ($ch, CURLOPT_PROXY, $proxy);
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_USERAGENT, $user_agent);
curl_setopt ($ch, CURLOPT_COOKIEJAR, "c:cookie.txt");
curl_setopt ($ch, CURLOPT_HEADER, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_TIMEOUT, 120);
$result = curl_exec ($ch);
curl_close($ch);
return $result;

或者

$curl=curl_init();
curl_setopt($curl,CURLOPT_URL, "https://www.lvtao.net");
curl_setopt($curl,CURLOPT_HEADER,1);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_POST,1);
curl_setopt($curl,CURLOPT_PROXYTYPE,CURLPROXY_SOCKS5);//使用了SOCKS5代理
curl_setopt($curl, CURLOPT_PROXY, "ip:1080");  
$data = array("user" => "geek", "password" => "fuck");
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
//curl_setopt($curl, CURLOPT_HTTPPROXYTUNNEL, 1);如果是HTTP代理
//curl_setopt($curl, CURLOPT_COOKIEJAR, "cookie.txt");cookie你懂的
$request = curl_exec($curl);
//var_dump($request);
curl_close($curl);

可能是ssl版本问题

$ch=curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSLVERSION, 3);