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<?php $obj = new stdClass; $obj->{123} = 456; $obj->{'456'} = 789; var_dump($obj->{123}, $obj->{'123'}, $obj->{456}, $obj->{'456'});
based on EU8V0
Output for 5.0.0 - 7.1.0
int(456) int(456) int(789) int(789)
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/SoSdH on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.