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<?php $pf = array( a => 1, b => 2 ); print_r( $pf) ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "a" in /in/LkipV:3 Stack trace: #0 {main} thrown in /in/LkipV on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20 - 7.1.33
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 )
Output for 7.1.10

Process exited with code 137.

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296.35 ms | 401 KiB | 398 Q