| 1 | <?php  | 
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| 20 | class RobotPlacer  | 
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| 21 | { | 
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| 22 | private $spaceInterface;  | 
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| 23 | |||
| 24 | private $robotRepository;  | 
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| 25 | |||
| 26 | /**  | 
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| 27 | * @param SpaceInterface $space  | 
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| 28 | * @param RobotRepositoryInterface $robotRepository  | 
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| 29 | */  | 
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| 30 | 2 | public function __construct(  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * @Subscribe  | 
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| 40 | * @param PlaceRobot $command  | 
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| 41 | */  | 
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| 42 | 1 | public function handlePlaceRobot(PlaceRobot $command): void  | 
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| 50 | }  | 
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| 51 | 
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: