本文實(shí)例分析了php中HTTP_REFERER函數(shù)用法。分享給大家供大家參考。具體分析如下：

利用php的http_referer函數(shù)來(lái)判斷用戶的來(lái)路,這是比較簡(jiǎn)單的,實(shí)例代碼如下:

if (isset($_SERVER['HTTP_REFERER'])) {

print "The page you were on previously was {$_SERVER['HTTP_REFERER']}
";

} else {

print "You didn't click any links to get here
";

}

?>

Click me!

下面是我們讓用戶不知道我們的來(lái)路處理,實(shí)例代碼如下:

$host = "www.jb51.net";

$referer = "http://".$host;

$fp = fsockopen ($host, 80, $errno, $errstr, 30);

if (!$fp){

echo "$errstr ($errno)
;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; MSIE 6.0; Windows NT 5.1)

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";

}

這不就行了?

不過(guò)很奇怪的是,www.jb51.net 的頁(yè)面抓下來(lái)是亂碼(除了http頭),這是為什么?難道是因?yàn)橛昧薵zip之類(lèi)壓縮?

$host = "www.jb51.net";

$html = file_get_contents("http://".$host);

$fp = file_put_contents("hao123.html",$html);

echo "done";

?>;

但這樣抓的就沒(méi)問(wèn)題,再來(lái)分析開(kāi)始抓的http頭:

HTTP/1.1 200 OK Date: Wed, 31 Aug 2005 00:59:36 GMT Server: Apache/1.3.27 Cache-Control: max-age=1296000 Expires: Thu, 15 Sep 2005 00:59:36 GMT Last-Modified: Mon, 29 Aug 2005 13:56:00 GMT Accept-Ranges: bytes Connection: close Content-Type: text/html Content-Encoding: gzip Content-Length: 14567

果然有這句,Content-Encoding:gzip ,原來(lái)壓縮了的,長(zhǎng)度14567字節(jié)了,用第二種方法抓,原來(lái)沒(méi)壓縮的html是71143字節(jié),原來(lái)file_get_contents還可以自動(dòng)解壓縮.

php實(shí)例二,代碼如下:

$host = '127.0.0.1';

$target = '/2.php';

$referer = 'https://www.jb51.net'; //偽造HTTP_REFERER地址

$fp = fsockopen($host, 80, $errno, $errstr, 30);

if (!$fp){

echo "$errstr($errno)
n";

}

else{

$out = "

GET $target HTTP/1.1

Host: $host

Referer: $referer

Connection: Closernrn";

fwrite($fp, $out);

while (!feof($fp)){

echo fgets($fp, 1024);

}

fclose($fp);

}

?>

另一個(gè)2.php文件很簡(jiǎn)單,只是寫(xiě)上一行讀取當(dāng)前的HTTP_REFERER服務(wù)器值的代碼即可,如下:

echo "

---

";

echo $_SERVER["HTTP_REFERER"];

?>

希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。

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