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<?php interface ParentMapperInterface { } interface ChildMapperInterface extends ParentMapperInterface { } class ChildMapper implements ChildMapperInterface { } class ParentClass { protected ParentMapperInterface $mapper; public function __construct(ParentMapperInterface $mapper) { $this->mapper = $mapper; } } class ChildClass extends ParentClass { protected int $other; public function __construct(ChildMapperInterface $mapper, int $other) { parent::__construct($mapper); $this->other = $other; } } $obj = new ChildClass(new ChildMapper(), 0);
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