3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(0=>1,1=>2, x=>y, p=>q); $check = true; unset($arr[0], $check); print_r($arr);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Undefined constant "x" in /in/6fbtG:3 Stack trace: #0 {main} thrown in /in/6fbtG 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 x - assumed 'x' (this will throw an Error in a future version of PHP) in /in/6fbtG on line 3 Warning: Use of undefined constant y - assumed 'y' (this will throw an Error in a future version of PHP) in /in/6fbtG on line 3 Warning: Use of undefined constant p - assumed 'p' (this will throw an Error in a future version of PHP) in /in/6fbtG on line 3 Warning: Use of undefined constant q - assumed 'q' (this will throw an Error in a future version of PHP) in /in/6fbtG on line 3 Array ( [1] => 2 [x] => y [p] => q )
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 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25
Notice: Use of undefined constant x - assumed 'x' in /in/6fbtG on line 3 Notice: Use of undefined constant y - assumed 'y' in /in/6fbtG on line 3 Notice: Use of undefined constant p - assumed 'p' in /in/6fbtG on line 3 Notice: Use of undefined constant q - assumed 'q' in /in/6fbtG on line 3 Array ( [1] => 2 [x] => y [p] => q )
preferences:
245.74 ms | 405 KiB | 426 Q