3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $pf = array( 'a' => 1, 'b' => 2 ); echo $pf[a]; print_r( $pf); ?>
Output for 7.2.0 - 7.3.0rc4
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/b8d0l on line 5 1Array ( [a] => 1 [b] => 2 )
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant a - assumed 'a' in /in/b8d0l on line 5 1Array ( [a] => 1 [b] => 2 )