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run code in 150+ php & hhvm versions
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<?php echo htmlentities('ó', ENT_COMPAT, 'UTF-8'), ' ', htmlentities('ó', ENT_COMPAT, 'ISO-8859-1'), ' ', htmlentities('ó');
Output for 5.4.0 - 7.1.0
&oacute; &Atilde;&sup3; &oacute;
Output for 4.3.2 - 5.3.29
&oacute; &Atilde;&sup3; &Atilde;&sup3;
Output for 4.3.0 - 4.3.1

Process exited with code 139.