php如何设置http代理

curl_setopt($ch, CURLOPT_PROXY, "127.0.0.1");
curl_setopt($ch, CURLOPT_PROXYPORT, "1234");
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);

或者

$proxy = "http://127.0.0.1:1234";
curl_setopt ($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);