I'm bad with ps on non-linux machines... but try running 'ps aux', it should give you a full list of every running process on your system, along with who is running them.
Look for a process with "apache" somewhere in the name, and then in the leftmost column, it should have the user that apache is running under.
Another way to check, is to have PHP create a file, then (again, in terminal), run 'ls -al' on the file, it should list the user and group that owns that file, and that is the owner and group of the process that created that file.
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