curl的一些小疑点

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://mmcfood.1x.net/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 GTB5');
$htmls = curl_exec($ch);
curl_close($ch);
preg_match("#]*)>(.*?)<table width="\"1079\"" ([^=""></table>#is", $htmls, $matches);
echo $matches[0];