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run code in 200+ php & hhvm versions
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<?php $foo = 'bar'; $$foo = 'baz'; $$$foo = 'qux'; $$$$foo = 'quux'; $$$$$foo = 1; var_dump($quux);
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.28 - 7.3.0beta3
int(1)