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<?php $x1 = 'Cl%C3%A9ment'; $x2 = 'Cl%E9ment'; $encoding_list = array('utf-8', 'iso-8859-1'); var_dump( mb_detect_encoding(urldecode($x1), $encoding_list), mb_detect_encoding(urldecode($x2), $encoding_list) );

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32.77 ms | 402 KiB | 5 Q