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<?php var_dump(mb_convert_case("AあいうえおBBcC", MB_CASE_FOLD_SIMPLE, "ISO-2022-JP")); mb_substitute_character("none"); var_dump(mb_convert_case("AあいうえおBBcC", MB_CASE_FOLD_SIMPLE, "ISO-2022-JP"));
Output for git.master_jit, git.master, rfc.property-hooks
string(20) "a???????????????bbcc" string(5) "abbcc"

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