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run code in 200+ php & hhvm versions
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<?php $foo = 1; switch(++$foo) { case ($foo == $foo): echo "horse"; break; case ($foo == 2): echo "hammer"; break; default: echo "wat"; break; } ?>
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0rc4
horse