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<?php $obj->{123} = 456; $obj->{'456'} = 789; var_dump($obj->{123}, $obj->{'123'}, $obj->{456}, $obj->{'456'});
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: Attempt to assign property "123" on null in /in/EU8V0:3 Stack trace: #0 {main} thrown in /in/EU8V0 on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Creating default object from empty value in /in/EU8V0 on line 3 int(456) int(456) int(789) int(789)
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
Strict Standards: Creating default object from empty value in /in/EU8V0 on line 3 int(456) int(456) int(789) int(789)
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Property name must be a string in /in/EU8V0 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.

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291.11 ms | 401 KiB | 312 Q