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<?php $arr = array(); $arr[PHP_INT_MAX] = null; $arr[] = null; var_dump($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: Cannot add element to the array as the next element is already occupied in /in/Nm4GZ:4 Stack trace: #0 {main} thrown in /in/Nm4GZ on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.2 - 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/Nm4GZ on line 4 array(1) { [9223372036854775807]=> NULL }

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150.09 ms | 403 KiB | 231 Q