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<?php var_dump(dechex(128)); $wrongUtf8 = mb_convert_encoding('öäü', 'UTF-8', 'ISO-8859-1'); var_dump($wrongUtf8); $validUtf8 = mb_convert_encoding($wrongUtf8, 'ISO-8859-1', 'UTF-8'); var_dump($validUtf8); var_dump(preg_match('/^./su', $validUtf8), preg_match('/[\x80-\xFF]/', $validUtf8));
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