[TYPO3-core] RFC: #13675: Use array_map() for t3lib_div::intExplode

[Christian Kuhn]

Christian Kuhn wrote:
> * Committed to trunk rev. 7053
> * Committed to 4.3 rev. 7054
> 
> after my additional +1 on reading and testing, my profiling showed a 
> performance boost of 50% for this method.

array_walk() expects the callback method to work on parameters by 
reference, but intval returns the value. Thus, the method did not work 
as before and intval had no effect.

Attached patch using array_map() was committed as a follow-up to:
* trunk rev. 7058
* 4.3 rev. 7059

Attached testcase was committed to:
* trunk rev. 7060

Regards
Christian
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