As 1stamour suggested the whole function was pointless. Not a big deal by itself but if you have layers upon layers of this stuff, code quickly becomes a buggy, unmaintainable mess. There are some awesome static code analysis tools like PMD and PHPMD for measuring code quality. It's not just "all programmers think everyone else's code is crap".

The code doesn't return just any boolean. No, it returns the boolean it was passed. And the calling code checks the result, what, against the boolean it passed in, I wonder? I'd worry about unintended side-effects depending on the language...