How to combine different versions of the same library?

Question

PHP

There are several libraries, each pulls to itself guzzle.
One is version 3, another is version 5, and the third is version 6.
You can of course rewrite everything for version 6. But I don't think this is an option.
How to correctly resolve the zoo of versions of one library?

Answer 1

Perhaps this is not the most painless option, but I would rewrite everything to 6, so that it would be easier to maintain later.
You can abstract code.

Answer 2

I don't know about guzzle, but I did it with jQuery.
Maybe you can do it