Php direct access prohibited

I have two files. File a is loaded by file B. I used to define a constant in file B, and then verified whether the constant exists in file a, but the verification failed. The code is as follows: file a: {code...} File B: & amp; lt ;? Phpdefine (& #039; HEIDOMAIN & #039;, True); require & #039; Inclu... I have two files. File a is loaded by file B. I used to define a constant in file B, and then verified whether the constant exists in file a, but the verification failed.
The code is as follows:
File:

File B:


How can I solve this problem?

Reply content:

I have two files. File a is loaded by file B. I used to define a constant in file B, and then verified whether the constant exists in file a, but the verification failed.
The code is as follows:
File:

File B:


How can I solve this problem?

a.php

php
    

Add quotation marks. otherwise, detection is performed.TrueIs this value defined.

Refer:
Http://php.net/manual/en/function.defined.php

In File a, require file B.