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run code in 200+ php & hhvm versions
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<?php $a="0wzz"; var_dump($a); $a++; var_dump($a); $a++; var_dump($a);
Output for 7.0.0 - 7.2.0
string(4) "0wzz" string(4) "0xaa" string(4) "0xab"
Output for 5.3.18 - 5.6.28
string(4) "0wzz" string(4) "0xaa" int(171)