filter

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+ issue https://github.com/rmasters/filter/issues/2

Glebaster6

Common filters should use mb_* functions for string manipulation

2

Hello, Just a note here: `upper`, `lower`, `capfirst` and `lowerfirst` filters [won't work](http://php.net/manual/pt_BR/function.mb-strtoupper.php#refsect1-function.mb-strtoupper-unicode) with accented chars in words like "Luís Fernando". You should use `mb_strtoupper`, `mb_strtolower` and `mb_convert_case` functions to...

lfbittencourt