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<?php $p = null; $p->x = 42; var_dump($p);
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 "x" on null in /in/WSQBf:3 Stack trace: #0 {main} thrown in /in/WSQBf on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Creating default object from empty value in /in/WSQBf on line 3 object(stdClass)#1 (1) { ["x"]=> int(42) }
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/WSQBf on line 3 object(stdClass)#1 (1) { ["x"]=> int(42) }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(stdClass)(1) { ["x"]=> int(42) }

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