php获取网页内容

1.file_get_contents 

<?php 
$url = "http://www.baidu.com"; 
$contents = file_get_contents($url); 
//如果出现中文乱码使用下面代码 
//$getcontent = iconv("gb2312", "utf-8",$contents); 
echo $contents; 
?> 

2.curl 

<?php 
$url = "http://www.baidu.com"; 
$ch = curl_init(); 
$timeout = 5; 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); 
//在需要用户检测的网页里需要增加下面两行 
//curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY); 
//curl_setopt($ch, CURLOPT_USERPWD, US_NAME.":".US_PWD); 
$contents = curl_exec($ch); 
curl_close($ch); 
echo $contents; 
?> 

3.fopen->fread->fclose 

<?php 
$handle = fopen ("http://www.baidu.com", "rb"); 
$contents = ""; 
do { 
　　$data = fread($handle, 1024); 
　　if (strlen($data) == 0) { 
　　　　break; 
　　} 
　　$contents .= $data; 
} while(true); 
fclose ($handle); 
echo $contents; 
?>