PHP cross-domain get previous page URL problem

For example, from www.baidu.com click the current page to jump to www.163.com $_server[' http_referer '] this variable once cross-domain, it becomes the current page, I want to get the previous page URL, how to break?

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For example, from www.baidu.com click the current page to jump to www.163.com $_server[' http_referer '] this variable once cross-domain, it becomes the current page, I want to get the previous page URL, how to break?

$_server[' Http_referer ' will fail if you jump from the SSL certification website link to your current page.
But non-SSL between different domain names jump $_server[' http_referer '] fetch the URL of the previous page should be no problem.

$_server[' Http_referer '] several possible reasons for not taking a value

• Hit the URL directly within the browser
• Hyperlink icon on the Windows desktop
• In-browser bookmarks
• Links in content such as Word,excel
• Links within the mail management software such as Outlook
• SSL authentication website jumps in
• Meta page settings automatically jump when example.com will not get Referer URL

Welcome to Add.

On the www.163.com page Print_r ($_server) See if there's anything you want.

$_server[' Http_referer ' #链接到当前页面的前一页面的 URL address

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