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How to get the redirect source in PHP?

WBOYOriginal: 2016-10-20 10:08:511015browse

How to get the redirect source in PHP?
For example, www.a.com redirects to www.b.com through header location. How does www.b.com obtain the redirection source to determine whether this visit is redirected from www.a.com?

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How to get the redirect source in PHP?

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