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run code in 300+ PHP versions simultaneously
<?php $foo = array(); $foo[PHP_INT_MAX] = 'hello'; $foo[] = 'world'; var_dump($foo);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
Fatal error: Uncaught Error: Cannot add element to the array as the next element is already occupied in /in/69mif:6 Stack trace: #0 {main} thrown in /in/69mif on line 6
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 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20 - 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/69mif on line 6 array(1) { [9223372036854775807]=> string(5) "hello" }
Output for 7.1.10

Process exited with code 137.
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.9
array(2) { [9223372036854775807]=> string(5) "hello" [-9223372036854775808]=> string(5) "world" }
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/69mif on line 5 array(2) { ["PHP_INT_MAX"]=> string(5) "hello" [0]=> string(5) "world" }

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