PHP file concatenator in C preprocessor style. Is there one?

Question

PHP

I came across a crazy and merciless task to write a certain library, but the customer stubbornly wants to get it in one file without dependencies.
I began to write it like that, and after 300 lines it became already sad to become.
Is there a tool in nature that will recursively process include/include_once/require/require_once statements and collect everything into one file without stripping comments from the code?
If at the same time it will also be friends with the composer, it’s generally good, but one can no longer believe in such fairy tales.

Answer 1

Collect in phar - there will be exactly one file. Have you noticed that the composer itself is packaged in composer.phar?
Is it possible to present a library packed into phar as a library for composer - I can't answer.

Answer 2

I haven't tried it myself, but maybe look in the direction of php.net/manual/en/book.phar.php ?
There, even in the comments, there is a piece of code that builds phar from the source folder.

Answer 3

write a script that parses php code tokens, find and change T_INCLUDE, T_REQUIRE to the actual contents of the files.... done