[TYPO3-core] RFC #10511: simplify and speed up t3lib_div::trimExplode()

[Ingo Renner]

ok too bad, but I had to create a third version after noticing that the 
thing with create_function() is quite slow - slower than the foreach 
loop we had before.
Thus I returned to the foreach loop for the case that we remove empty 
elements.

speed improvements with this version:
10-25% when removing empty elements
25-40% when keeping empty elements

There will be another little boost when fixing the behavior of $limit, 
but that's a different issue.


best
Ingo

-- 
Ingo Renner
TYPO3 Core Developer, Release Manager TYPO3 4.2

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