PHP picture file Download file anti-theft chain setting method

PHP anti-theft Chain

The code is as follows	Copy Code
<?php Session_Start (); Session_register (' check '); $_session[' Check ']=true; ?>

Check session variables to determine whether to visit the home page. And check that his source page reference (Http_referer) is from the local Web site's Web page.
The method is as follows:

The code is as follows	Copy Code
<?php Session_Start (); $refs = Parse_url ($_server[' http_referer ')); Decomposition Reference web Information Check home session and source host are the same if (!) ( $_session[' check ') | | $refs [' Host ']!= $_server[' http_host ']) Exit ?>

Note: This can only be a simple anti-theft chain, if a little bit of understanding can be cracked,

Use the server to set up the PHP burglar connection

Apache anti-theft Chain

Modify Httpd.conf

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Setenvifnocase Referer "^" local_ref=1 <filesmatch ". (gif|jpg) "> Order Allow,deny Allow from Env=local_ref </FilesMatch>

If you want to display a "no hotlinking" picture, we can use the mod_rewrite to achieve.
First, add the--enable-rewrite parameter to load the Mod_rewrite module when you install Apache.
Suppose the "Prohibit hotlinking" picture is abc.gif and we can configure this in httpd.conf:

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Rewriteengine on Rewritecond%{http_referer}!^$ Rewritecond%{http_referer}!^http://(www.)? Www.111cn.net/.*$ [NC] Rewriterule. (gif|jpg) $ abc.gif [r,l] DocumentRoot "/usr/local/apache/htdocs" #设置存放站点html文件的目录. <directory/> Options FollowSymLinks AllowOverride None </Directory>

IIS anti-theft Chain

Execute file selection C:rewriterewrite.dll that's it.
Httpd.ini is a configuration file
Picture anti-theft chain Code

code is as follows	copy code
[Isapi_ Rewrite] # 3600 = 1 hour Cacheclockrate 3600 Repeatlimit # # Protect Httpd.ini and Httpd.parse.errors Files # from accessing through HTTP Rewritecond Host: (. +) Rewritecond Referer: (?! http://1.*). * Rewriterule. *. (?: gif|jpg|png|bmp)/force.gif [i,o]