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c8e65c9d74
mb_convert_kana has conversion modes selected using 'M'/'m', which convert a few various punctuation and symbol characters between 'ordinary' and full-width forms. The constants which refer to these modes have names ending with COMPAT1. Internally, there are similar conversion modes with names ending in COMPAT2. They are like COMPAT1 modes, but they operate on a smaller set of characters. But... that is all just dead code, because there is no way for user code to select the COMPAT2 modes. I have no idea what the original author intended those COMPAT2 modes to actually be used for. Guess it doesn't really matter, anyways. At this point, it's just more food for the flames.