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<?php var_dump(setlocale(LC_ALL, 'de_DE.ISO-8859-1')); echo bin2hex(str_ireplace(["\xE4", "\xF6", "\xFC"], ['1', '2', '3'], "\xE4\xC4 \xF6\xD6 \xFC\xDC")) . PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
string(16) "de_DE.ISO-8859-1" 31c42032d62033dc

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