Global variables in PHP reference issues in multiple files

Global variables in PHP reference problems in multiple files
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Can not be defined in a PHP file global variables, B PHP file Reference and assignment, C PHP file Reference and access, I test it seems not possible. b, you can only see the contents of a in C, and you cannot see the value after B changed.

Thank you
------Solution--------------------
Of course, if you're
c.php

Include ' a.php ';
Include ' b.php ';

Or
b.php

Include ' a.php ';

c.php

Include ' b.php ';

------Solution--------------------
You c PHP does not reference b PHP it?

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