php解析url的三个示例

$url="http://.baidu."; 
file_get_contents($url); 

// CURL 方法 
$url="http://.baidu."; 
$ch = curl_init(  ); 
curl_set( $ch,CURLOPT_URL,$url ); 
curl_set( $ch,CURLOPT_HEADER,0 ); 
curl_set( $ch,CURLOPT_RETURNTRANSFER,1 ); 
$ret= curl_exec( $ch ); 
curl_close( $ch ); 
echo $ret; 

$url="http://.baidu."; 
$fp=fopen($url,"r"); 
$response = ''; 
while($row = fgets($fp)) { 
$response.= trim($row)."\n"; 
}

Resolving .xxx.... 114.xxx.xxx.xxx
Connecting to .xxx.|114.xxx.xxx.xxx|:80... connected.
HTTP request sent, awaiting response... 403 Forbidden
10:58:22 ERROR 403: Forbidden.