Add php 8.4 compatibility

[julien-maurel]

Hi
I'm not sure everything is ok, i did it for my needed so I just know that .deb file works
But if these changes can help...

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[intuibase]

Hey @julien-maurel
Thank you for your contribution.
I've updated yours branch a bit to pass static and phpt tests. I hope you don’t mind that I pushed some changes to your repository.

[julien-maurel]

Hey @julien-maurel Thank you for your contribution. I've updated yours branch a bit to pass static and phpt tests. I hope you don’t mind that I pushed some changes to your repository.

You're welcome, I would have liked to finish it, but difficult to take time to check how CI and other formats work.
No worries, commit as you like, I fork it just do do the PR :)