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run code in 150+ php & hhvm versions
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<?php $foo="2d9"; var_dump($foo); $foo++; var_dump($foo); $foo++; var_dump($foo);
based on 7l9Uf
Output for 4.3.0 - 7.1.0
string(3) "2d9" string(3) "2e0" float(3)