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<?php $obj = (object)array(1,2,3); $obj->{1} = "Double array key!"; var_dump((array)$obj);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(3) { [0]=> int(1) [1]=> string(17) "Double array key!" [2]=> int(3) }
Output for 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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["1"]=> string(17) "Double array key!" }
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Property name must be a string in /in/ELoWa on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.
preferences:
315.11 ms | 401 KiB | 461 Q