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<?php defined('PHP_INT_MAX') or define('PHP_INT_MAX', is_int(0x7FFFFFFF+1) ? 0x7FFFFFFFFFFFFFFF : 0x7FFFFFFF); $a = array(PHP_INT_MAX => 42); $a[] = 37; var_dump($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/As2H4:4 Stack trace: #0 {main} thrown in /in/As2H4 on line 4
Process exited with code 255.
Output for 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 - 7.2.34, 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/As2H4 on line 4 array(1) { [9223372036854775807]=> int(42) }

preferences:
255.46 ms | 404 KiB | 413 Q