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<?php class Wagon {} class Train { public function __construct(array $wagons) { $this->wagons = (function (Wagon $wagons) { return $wagons; })(...$wagons); } } var_dump(new Train([new Wagon, new Wagon, new Wagon]));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: Creation of dynamic property Train::$wagons is deprecated in /in/0dH8X on line 9 object(Train)#1 (1) { ["wagons"]=> object(Wagon)#2 (0) { } }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
object(Train)#1 (1) { ["wagons"]=> object(Wagon)#2 (0) { } }
Output for 5.4.8 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/0dH8X on line 11
Process exited with code 255.

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