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run code in 150+ php & hhvm versions
Bugs & Features
<?php //$a1 = array(1,3,5); //$a1 = array(); echo (!isset($a1) || array_key_exists(20, $a1)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1