$ch = curl_init();
$timeout = 30;
curl_setopt($ch, CURLOPT_URL, $requestUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_PROXYAUTH, CURLAUTH_BASIC); //代理认证模式
curl_setopt($ch, CURLOPT_PROXY, "218.108.71.254"); //代理服务器地址
curl_setopt($ch, CURLOPT_PROXYPORT, 3128); //代理服务器端口
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP); //使用http代理模式
$file_contents = curl_exec($ch);
curl_close($ch);