How to pass a value in two PHP documents

How to pass a value in two PHP documents
In the function of a PHP document to calculate an intermediate value, in the function of another PHP file to use this intermediate value, ask, how can I achieve this intermediate value between the different documents pass?

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What is the relationship between the two documents?

Commonly used are: Post/get/cookie/session ...... such as.
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An intermediate value is computed in function A of PHP document A, which is used in function B of another PHP file B.

Then there are: PHP document C
Include ' PHP document a ';
Include ' PHP document B ';

$v = function B (function A ());
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I'm not going to use the stupidest way.
Referencing a common function
When you use it, count it again.

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Use the session to secure some
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The question is, if the B document contains a document, is the global variable in the a document not the same as the global variable in the a document?
Yes, variables/functions can be accessed directly in B

Your situation can be directly with include, or with Session/cookie.

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