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run code in 200+ php & hhvm versions
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<?php $a = '2d9'; var_dump($a);$a++; var_dump($a);$a++; var_dump($a);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
string(3) "2d9" string(3) "2e0" float(3)