PHP uses the REFERER root residence to access the address for page jump

This article mainly judges the source based on the referfer and jumps to the page to prevent the page from being inaccessible. the user experience is poor. for example, I developed a yellow page source code and transferred it to my home. Previously set a demo program address: http://www.jb51.net and now this domain name needs to be used for other sites, and do not kill the original demo address failure what to do. Then I can use php referer to determine the source. if it is from the address of the webmaster download site, I will transfer it to the site domain name.

I just put the following code in index. php on the http://www.jb51.net site to get it from files.jb51.net access to my server frequently used software download http://s.jb51.net

You can go to the demo address on this page.

The code is as follows:

$ ReferHost = parse_url ($ _ SERVER ['http _ referer'], PHP_URL_HOST );
$ ValidDomain = 'files .jb51.net ';
$ Valid = strstr ($ referHost, $ validDomain) ==$ validDomain;
If (! Empty ($ valid )){
Echo 'script location. href = "http://s.jb51.net"; script ';
Exit;
}