淘宝用的是怎么的技术，防止被采集的？如何用php采集淘宝的数据呢？

<?php 
header("content-type:text/html;charset=gbk");
$curl = curl_init('http://list.tmall.com/search_product.htm?q=%D1%A9%B7%C4%C9%C0&click_id=%D1%A9%B7%C4%C9%C0');
$header = array();
$header[] = 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8';
$header[] = 'Accept-Encoding: gzip, deflate, sdch';
$header[] = 'Accept-Language: zh-CN,zh;q=0.8';
$header[] = 'Cache-Control: max-age=0';
$header[] = 'Connection: keep-alive';
$header[] = 'Cookie: uc3=nk2=0M56YNYN%2BA4%3D&id2=W8rr4uUwfV5Z&vt3=F8dAT%2B%2BMdeVt9sjBn%2Bk%3D&lg2=WqG3DMC9VAQiUQ%3D%3D; lgc=%5Cu695A%5Cu5929%5Cu5B9D%5Cu9676; tracknick=%5Cu695A%5Cu5929%5Cu5B9D%5Cu9676; t=45643498fa8ff940a0534abf468c496b; _tb_token_=5touPdVYykOo; cookie2=9cc3ace3ba141f7e0e950da7b4782eae; tt=segmentfault.com; res=scroll%3A1349*6222-client%3A1349*667-offset%3A1349*6222-screen%3A1366*768; pnm_cku822=055UW5TcyMNYQwiAiwQRHhBfEF8QXtHcklnMWc%3D%7CUm5Ockt1T3BEf0N%2BSnJPciQ%3D%7CU2xMHDJ7G2AHYg8hAS8WKQcnCVU0Uj5ZJ11zJXM%3D%7CVGhXd1llXGJYZ1NoVGldZVhlUm9NeEd9SHFFfElyR35Be0N%2FR2k%2F%7CVWldfS0TMwY8ACAcKQkncVU4XSNKGn9AZE8BUDxQCW4PIXch%7CVmhIGCUFOBgkGiMXNwwzDDMTLxEqETELMAUlGSccJwc9AjdhNw%3D%3D%7CV25Tbk5zU2xMcEl1VWtTaUlwJg%3D%3D; cq=ccp%3D1; l=AikpB1ewOIvOADHsO87Aa9qtuduD9B0s; otherx=e%3D1%26p%3D*%26s%3D0%26c%3D0%26f%3D0%26g%3D0%26t%3D0; swfstore=142738; isg=4C03295B995DB1CB7ADB1CC702592A48';
$header[] = 'Connection: keep-alive';
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
// 不输出header头信息
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
// 伪装浏览器
curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36');
// 保存到字符串而不是输出
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$rs = curl_exec($curl);
curl_close($curl);
echo $rs;