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run code in 150+ php & hhvm versions
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<?php $z = 'z'; var_dump($z++); $z++; var_dump($z);
based on oHo80
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "z" string(2) "ab"