有没有办法在PHP中获取启动页面的URL

Question

In PHP 5.6, if I am on a page A, and if page A launch page B, is there a way to get the URL of a page A from page B?

Please note that I do not want to use query parameters to pass the values of a URL A when I launch page B from page A.

Answer 1

If the browser (user agent) supports it, you could use:

$_SERVER['HTTP_REFERER']

'HTTP_REFERER'

The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.

From: http://php.net/manual/en/reserved.variables.server.php