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<?php $utf8 = 'ÄÖÜ'; // file must be UTF-8 encoded echo $utf8 . PHP_EOL; $iso88591_1 = utf8_decode($utf8); echo $iso88591_1 . PHP_EOL; $iso88591_2 = iconv('UTF-8', 'ISO-8859-1', $utf8); echo $iso88591_2 . PHP_EOL; $iso88591_2 = mb_convert_encoding($utf8, 'ISO-8859-1', 'UTF-8'); echo $iso88591_2 . PHP_EOL; $iso88591 = 'ÄÖÜ'; // file must be ISO-8859-1 encoded echo $iso88591 . PHP_EOL; $utf8_1 = utf8_encode($iso88591); echo $utf8_1 . PHP_EOL; $utf8_2 = iconv('ISO-8859-1', 'UTF-8', $iso88591); echo $utf8_2 . PHP_EOL; $utf8_2 = mb_convert_encoding($iso88591, 'UTF-8', 'ISO-8859-1'); echo $utf8_2 . PHP_EOL; $utf8_string = "\xC3\xAB"; echo $utf8_string . PHP_EOL;