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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(isset($a)); var_dump(null === $a);
Output for 5.0.4 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
bool(false) Notice: Undefined variable: a in /in/cQF6Z on line 4 bool(true)
Output for 4.3.0 - 5.0.3
bool(false) Notice: Undefined variable: a in /in/cQF6Z on line 4 bool(true)