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run code in 300+ PHP versions simultaneously
<?php $a[PHP_INT_MAX] = 22; echo $a[] = 42; var_dump($a);
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: Cannot add element to the array as the next element is already occupied in /in/4CrrK:3 Stack trace: #0 {main} thrown in /in/4CrrK on line 3
Process exited with code 255.
Output for 5.2.10 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Cannot add element to the array as the next element is already occupied in /in/4CrrK on line 3 array(1) { [9223372036854775807]=> int(22) }
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.9
42array(2) { [9223372036854775807]=> int(22) [-9223372036854775808]=> int(42) }
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/4CrrK on line 2 42array(2) { ["PHP_INT_MAX"]=> int(22) [0]=> int(42) }

preferences:
303.42 ms | 402 KiB | 459 Q