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run code in 200+ php & hhvm versions
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<?php $foo = 'bar'; $ $foo = 'baz'; var_dump($bar);
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0rc1
string(3) "baz"