<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://dota2.ru/forum/');
curl_setopt($ch, CURLOPT_HTTPGET, true);
curl_setopt($ch, CURLOPT_COOKIE,'xf_session=1234567');
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
//curl_setopt($ch, CURLOPT_PROXY, '127.0.0.1:8888');
$out=curl_exec($ch);
//$info = curl_getinfo($ch);
//print_r($info['request_header']);
echo $out;
curl_close($ch);

$postdata = array(
    'login' => "логин",
    'password' => "пароль",
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://dota2.ru/forum/login/");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt($ch, CURLOPT_COOKIEJAR, "cookie.txt");
$result = curl_exec($ch);
curl_close($ch);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://dota2.ru/forum/forums/samoe-   obsuzhdaemoe.164/");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, "cookie.txt");
$res = curl_exec($ch);
curl_close($ch);