[TYPO3-core] RFC #13681: Improve performance of t3lib_div::revExplode

[Nikolas Hagelstein]

This is an SVN patch request.

Type:  Code cleanup

Bugtracker references:
http://bugs.typo3.org/view.php?id=13681

Branches:
TYPO3_4_3 & TRUNK

Problem:
The function use a foreach loop for a simple strrev.

Solution:
Replace foreach by array_walk.

Notes:
Using array_walk  instead of loops for simple operations is
significantly faster. Furthermore there is no need to use temp
variables since array_walk directly manipuplates the given array - in
contrast to array_map.

Cheers,
NIkolas
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