$ _ SERVER ['http _ referer ']

$ _ SERVER ['http _ referer'] how to use this? $ _ SERVER ['http _ referer'] how to use it? & Lt ;? Php & nbsp; $ v_url =$ _ SERVER ['http _ referer']; & nbsp; p $ _ SERVER ['http _ referer?
$ _ SERVER ['http _ referer'] how to use it?



$ V_url = $ _ SERVER ['http _ referer'];
Print_r ($ v_url );
?>


I wrote this, and then opened this page on both my machine and other machines,


But nothing is output.

------ Solution --------------------
"HTTP_REFERER"
URL of the previous page linked to the current page

This value can be obtained only when you click a URL similar to a page.

For example

Xxx

If you cannot jump to anything through flash js
------ Solution --------------------
HTTP Referer is a part of the header. when a browser sends a request to a web server, it usually carries a Referer to tell the server from which page the link is sent.

If you only enter the url in the address bar of the browser, no $ _ SERVER ['http _ referer'] is available, or $ _ SERVER ['http _ referer'] is blank.