[TYPO3-core] Usage of mb_* functions in the core (especially in rtehtmlarea)

[Michael Stucki]

Hi folks,

I noticed that rtehtmlarea often uses multibyte (mb_*) functions when 
performing string operations.

The problem with that is that mb_* functions are not available on all systems, 
therefore t3lib_cs should be used which acts as a wrapper for any charset 
related stuff (which makes it possible to use a alternatives to the mb_* 
functions).

Question: Do we have a rule for their usage? If not, I think this should be 
added to the coding guidelines.

- michael
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