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run code in 200+ php & hhvm versions
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<?php echo htmlentities('ääkköset');
Output for 5.4.0 - 7.1.10
&auml;&auml;kk&ouml;set
Output for 4.3.0 - 5.3.29
&Atilde;&curren;&Atilde;&curren;kk&Atilde;&para;set