[TYPO3-dev] Typo3 4.2 Cache Bug?

[Klaus Hinum]

Dmitry Dulepov [typo3] schrieb:
> Klaus Hinum wrote:
>> We don't have mbstring installed (have ordered it at our server). 
>> using mb_substr() should solve the problem, but afaik the problem 
>> started after the upgrade to 4.2 (we did not update php at this 
>> moment, perhaps a security update was installed).
>>
>> Only the caching is affected. The uncached preview is working fine 
>> (only the "ä" for example is cut to an "?").
> 
> But this means that something is still wrong at your installation. ? 
> means that character sets are not handled properly. Solving it may solve 
> cache problem too.
> 
> Do you have forceCharset set to something in Install tool?
> 
> I have no problems on 8 sites that use non-latin1 characters.
> 

I have forceCharset set to UTF-8 and also have set an UTF-8 connection 
to the db with [SYS][setDBinit]

We have now solved the problem by using the mb_substr() function. Still 
I think the Typo3 cache shouldn't just stop writing the cached data in 
the db without any error message.

Does the Typo3 string cutting function take UTF-8 into consideration? 
Does it need mbstring?

Greetings
Klaus