3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array( 1 => 'dfdfdf', 2 => 'fsdfsdf' ); echo array_key_exists('1a', $a) ? 1 : 0;
based on ksYL6
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
0