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run code in 200+ php & hhvm versions
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<?php $foo = ""; $bar = 0; $baz = "\0"; var_dump(isset($foo)); var_dump(isset($bar)); var_dump(isset($baz));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.1.7
bool(true) bool(true) bool(true)
Output for hhvm-3.12.14

Process exited with code 137.