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sadly, after iOS5 finally released, I got report from my users that they can not login.
Because there is emoji symbol in there names, and apple changed the encoding of emoji.
so there username contains a old version of emoji, how could I convert them to the new encoding?
thanks!
be specific: one emoji symbol “tiger”, it is “\U0001f42f” in iOS5, but “\ue050” in earlier iOS version.
iOS 5 and OS X 10.7 (Lion) use the Unicode 6.0 standard ‘unified’ code points for emoji.
iOS 4 on SoftBank iPhones used a set of unofficial code points in the Unicode Private Use Area, and so aren’t compatible with any other systems. To convert from this format to proper Unicode 6.0 characters, you’ll need to run a big lookup table from Softbank code to Unified over all your current data and all new form data as it gets submitted. You might also want to do Unicode normalisation at this point, so that eg. fullwidth letters match normal ASCII letters.
See for example this table from a library that does emoji conversion tasks for PHP.
Emoji in usernames though?