3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $pf = array( a => 1, b => 2 ); print_r( $pf) ?>
Output for 7.2.0
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/LkipV on line 3 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/LkipV on line 3 Array ( [a] => 1 [b] => 2 )
Output for 7.1.10

Process exited with code 137.
Output for 4.3.0 - 7.1.7
Notice: Use of undefined constant a - assumed 'a' in /in/LkipV on line 3 Notice: Use of undefined constant b - assumed 'b' in /in/LkipV on line 3 Array ( [a] => 1 [b] => 2 )