求高手，模拟浏览器抓取网页,该如何处理

function file_get($url){
	 ob_start();
	 $ch = curl_init();
	 
	 curl_setopt($ch, CURLOPT_COOKIEJAR, "./cookie.txt");
	 curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; InfoPath.1; CIBA)");
	curl_setopt($ch, CURLOPT_URL, $url);
	 curl_setopt($ch, CURLOPT_HEADER, FALSE);
	 curl_setopt($ch, CURLOPT_COOKIESESSION, TRUE);
	 curl_setopt($ch, CURLOPT_NOBODY, FALSE);

	 curl_exec($ch);
	 curl_close($ch);
	 $content = ob_get_clean();
	 
	 

	return $content;

}