php 模拟用户抓取网页内容程序

function _link($url){
$contents = @file_get_contents("$url");
if($contents=="Forbidden" || $contents==""){
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, "$url");
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$contents = curl_exec($ch);
curl_close($ch);
}
if(empty($contents)){
exit('cant locaion.');
}
preg_match_all("/charset=(.*?)>/is",$contents,$cod);
if(!empty($cod[1][0])){
if(preg_match("/utf-8/i",$cod[1][0])){
$contents=iconv("UTF-8","gbk//TRANSLIT",$contents);
}
}
return $contents;
}