PHP prohibits direct access to the problem

I have two files, a file is loaded by B file, I used to define constants in B file, and then verify in a file whether there is this constant, but the validation is invalid.
The code is as follows:
A file:

b文件：


求助如何解决？

Reply content:

I have two files, a file is loaded by B file, I use the B file to define the constants, and then in a file to verify whether there is this constant, but the validation is invalid. The
code is as follows:
A file:

 !--? phpif (!defined (Heidomain)) {exit ("123");}   

B File:

!--? phpdefine (' Heidomain ', True); require '/include /makeuser.php ';? -->
Help How to solve?

a.php

  php  !--? phpif (!defined (' Heidomain ')} {exit (" 123 ");   

quotation marks, or detection True Whether this value is defined.

Reference:
http://php.net/manual/en/function.defined.php

To require the B file in a file

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