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run code in 200+ php & hhvm versions
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<?php $s = "Dörsch"; $s2 = htmlentities($s,ENT_QUOTES,'UTF-8'); echo $s; echo $s2;
Output for 4.3.2 - 7.2.0
DörschD&ouml;rsch
Output for 4.3.0 - 4.3.1

Process exited with code 139.