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<?php $str = "&#xC9;"; //É $res = mb_strtolower(html_entity_decode($str,'UTF-8'), 'UTF-8' ); echo $res;
Output for rfc.literals
Fatal error: Uncaught TypeError: html_entity_decode(): Argument #2 ($flags) must be of type int, string given in /in/uA4iv:4 Stack trace: #0 /in/uA4iv(4): html_entity_decode('&#xC9;', 'UTF-8') #1 {main} thrown in /in/uA4iv on line 4
Process exited with code 255.

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