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

[Stanislas Rolland]

Hi Michael,
> I noticed that rtehtmlarea often uses multibyte (mb_*) functions when 
> performing string operations.
>   
I may be mistaken, but I think that mb_ functions are used only in the 
Spell Checker. This is documented in the requirements section of the manual.
However, I will check if the required functions could now be provided by 
t3lib_cs.
> 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.
>   
I do not see it in the Coding guidelines. Perhaps it should be added.

Stanislas
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