如題，到底哪里出錯(cuò)了？

<?php
/**
?* 慕課網(wǎng)視頻教學(xué)
?* 代碼實(shí)例-PHP-cURL實(shí)戰(zhàn)
?* 實(shí)例描述：登錄慕課網(wǎng)并下載個(gè)人空間頁(yè)面
?* 自定義實(shí)現(xiàn)頁(yè)面鏈接跳轉(zhuǎn)抓取
?*
?*/
$data='username=demo_peter@126.com&password=123qwe&remember=1';
$curlobj = curl_init();
$cookie_file=fopen($_SERVER['DOCUMENT_ROOT']."\cookies.txt","w");?? ??? ??? ?// 初始化
curl_setopt($curlobj, CURLOPT_URL, "http://idcbgp.cn/user/login");?? ??? ?// 設(shè)置訪問網(wǎng)頁(yè)的URL
curl_setopt($curlobj, CURLOPT_RETURNTRANSFER, true);?? ??? ??? ?// 執(zhí)行之后不直接打印出來

// Cookie相關(guān)設(shè)置，這部分設(shè)置需要在所有會(huì)話開始之前設(shè)置
date_default_timezone_set('PRC'); // 使用Cookie時(shí)，必須先設(shè)置時(shí)區(qū)
curl_setopt($curlobj, CURLOPT_COOKIESESSION, TRUE);
curl_setopt($curlobj,CURLOPT_COOKIEFILE,$_SERVER['DOCUMENT_ROOT']."\cookies.txt");
curl_setopt($curlobj,CURLOPT_COOKIEJAR,$_SERVER['DOCUMENT_ROOT']."\cookies.txt");
curl_setopt($curlobj,CURLOPT_COOKIE,session_name()."=".session_id());
curl_setopt($curlobj, CURLOPT_HEADER, 0);
// 注釋掉這行，因?yàn)檫@個(gè)設(shè)置必須關(guān)閉安全模式 以及關(guān)閉open_basedir，對(duì)服務(wù)器安全不利
//curl_setopt($curlobj, CURLOPT_FOLLOWLOCATION, 1); ?

curl_setopt($curlobj, CURLOPT_POST, 1); ?
curl_setopt($curlobj, CURLOPT_POSTFIELDS, $data); ?
curl_setopt($curlobj, CURLOPT_HTTPHEADER, array("application/x-www-form-urlencoded; charset=utf-8",
?? ?"Content-length: ".strlen($data)
?? ?));
curl_exec($curlobj);?? ?// 執(zhí)行
curl_setopt($curlobj, CURLOPT_URL, "http://idcbgp.cn/space/index");
curl_setopt($curlobj, CURLOPT_POST, 0); ?
curl_setopt($curlobj, CURLOPT_HTTPHEADER, array("Content-type: text/xml"
?? ?));
$output=curl_redir_exec($curlobj);?? ?// 執(zhí)行
curl_close($curlobj);?? ??? ??? ?// 關(guān)閉cURL
echo $output;

/**
?* 自定義實(shí)現(xiàn)頁(yè)面鏈接跳轉(zhuǎn)抓取
?*/
function curl_redir_exec($ch,$debug="")
{
??? static $curl_loops = 0;
??? static $curl_max_loops = 20;

??? if ($curl_loops++ >= $curl_max_loops)
??? {
??????? $curl_loops = 0;
??????? return FALSE;
??? }
??? curl_setopt($ch, CURLOPT_HEADER, true); // 開啟header才能夠抓取到重定向到的新URL
??? curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
??? $data = curl_exec($ch);
??? // 分割返回的內(nèi)容
??? $h_len = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
??? $header = substr($data,0,$h_len);
??? $data = substr($data,$h_len - 1);

??? $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
??? if ($http_code == 301 || $http_code == 302) {
??????? $matches = array();
??????? preg_match('/Location:(.*?)\n/', $header, $matches);
??????? $url = @parse_url(trim(array_pop($matches)));
??????? // print_r($url);
??????? if (!$url)
??????? {
??????????? //couldn't process the url to redirect to
??????????? $curl_loops = 0;
??????????? return $data;
??????? }
??????? $last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));
??????? if (!isset($url['scheme']))
??????????? $url['scheme'] = $last_url['scheme'];
??????? if (!isset($url['host']))
??????????? $url['host'] = $last_url['host'];
??????? if (!isset($url['path']))
??????????? $url['path'] = $last_url['path'];

??????? $new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] . (isset($url['query'])?'?'.$url['query']:'');
??????? curl_setopt($ch, CURLOPT_URL, $new_url);

??????? return curl_redir_exec($ch);
??? } else {
??????? $curl_loops=0;
??????? return $data;
??? }
}
?>