php中HTTP_REFERER函数用法实例
本文实例分析了php中HTTP_REFERER函数用法。分享给大家供大家参考。具体分析如下：
利用php的http_referer函数来判断用户的来路,这是比较简单的,实例代码如下:
<?php
if(isset($_SERVER['HTTP_REFERER'])){
print"Thepageyouwereonpreviouslywas{$_SERVER['HTTP_REFERER']}<br/>";
}else{
print"Youdidn'tclickanylinkstogethere<br/>";
}
?>
<ahref="refer.php">Clickme!</a>下面是我们让用户不知道我们的来路处理,实例代码如下:
<?php
$host="www.nhooo.com";
$referer="http://".$host;
$fp=fsockopen($host,80,$errno,$errstr,30);
if(!$fp){
echo"$errstr($errno)<br>;n";
}else{
$request="
GET/HTTP/1.1
Accept:image/gif,image/x-xbitmap,image/jpeg,image/pjpeg,application/x-shockwave-flash,application/vnd.ms-powerpoint,application/vnd.ms-excel,application/msword,*/"."*
Referer:http://$host
Accept-Language:zh-cn
Accept-Encoding:gzip,deflate
User-Agent:Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1)
Host:$host
Connection:Close"
."rnrn";
fputs($fp,"$request");
while(!feof($fp))
{
$res[]=fgets($fp,1024);
}
$html=join("",$res);
fclose($fp);
$fp=file_put_contents("123cha.html",$html);
echo"done";
}这不就行了?
不过很奇怪的是,www.nhooo.com的页面抓下来是乱码(除了http头),这是为什么?难道是因为用了gzip之类压缩?
<?php
$host="www.nhooo.com";
$html=file_get_contents("http://".$host);
$fp=file_put_contents("hao123.html",$html);
echo"done";
?>;但这样抓的就没问题,再来分析开始抓的http头:
HTTP/1.1200OKDate:Wed,31Aug200500:59:36GMTServer:Apache/1.3.27Cache-Control:max-age=1296000Expires:Thu,15Sep200500:59:36GMTLast-Modified:Mon,29Aug200513:56:00GMTAccept-Ranges:bytesConnection:closeContent-Type:text/htmlContent-Encoding:gzipContent-Length:14567
果然有这句,Content-Encoding:gzip,原来压缩了的,长度14567字节了,用第二种方法抓,原来没压缩的html是71143字节,原来file_get_contents还可以自动解压缩.
php实例二,代码如下:
<?php
$host='127.0.0.1';
$target='/2.php';
$referer='https://www.nhooo.com';//伪造HTTP_REFERER地址
$fp=fsockopen($host,80,$errno,$errstr,30);
if(!$fp){
echo"$errstr($errno)<br/>n";
}
else{
$out="
GET$targetHTTP/1.1
Host:$host
Referer:$referer
Connection:Closernrn";
fwrite($fp,$out);
while(!feof($fp)){
echofgets($fp,1024);
}
fclose($fp);
}
?>另一个2.php文件很简单,只是写上一行读取当前的HTTP_REFERER服务器值的代码即可,如下:
<?php echo"<hr/>"; echo$_SERVER["HTTP_REFERER"]; ?>
希望本文所述对大家的php程序设计有所帮助。