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<?php $simple = (object)['bar' => ['x' => 'bar']]; var_dump($simple->huh->x);
based on NvG9S
Output for 8.0.0alpha3 - beta3
Warning: Undefined property: stdClass::$huh in /in/5ZTXW on line 4 Warning: Attempt to read property "x" on null in /in/5ZTXW on line 4 NULL
Output for 8.0.0alpha1 - alpha2
Warning: Undefined property: stdClass::$huh in /in/5ZTXW on line 4 Warning: Attempt to read property 'x' on null in /in/5ZTXW on line 4 NULL
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.10
Notice: Undefined property: stdClass::$huh in /in/5ZTXW on line 4 Notice: Trying to get property 'x' of non-object in /in/5ZTXW on line 4 NULL
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Undefined property: stdClass::$huh in /in/5ZTXW on line 4 Notice: Trying to get property of non-object in /in/5ZTXW on line 4 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/5ZTXW on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/5ZTXW on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/5ZTXW on line 3
Process exited with code 255.