You can view the Pull Request on github:
https://github.com/php/php-langspec/pull/89
Pull Request Description:
The explanations about script inclusions were to wage IMO. Tried to further explain what is meant with:
> It is important to understand that unlike the C/C++ (or similar)
> preprocessor, script inclusion in PHP is not a text substitution
> process. That is, the contents of an included file are not treated as if
> they directly replaced the inclusion operation source in the including
> file
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