Online PHP editor | output for t01Ir

<?php interface Employee {} class SteelFactoryEmployee implements Employee {} class CarsFactoryEmployee implements Employee {} interface Factory { public function hire(Employee $employee): bool; } class SteelFactory implements Factory { public function hire(Employee $employee): bool { if (! $employee instanceof SteelFactoryEmployee) { throw new InvalidArgumentException('Employee should be ' . SteelFactoryEmployee::class); } return true; } } class CarsFactory implements Factory { public function hire(Employee $employee): bool { if (! $employee instanceof CarsFactoryEmployee) { throw new InvalidArgumentException('Employee should be ' . CarsFactoryEmployee::class); } return true; } } class EmploymentDepartment { public function hireNewEmployee(Factory $factory, Employee $employee): void { $factory->hire($employee); } } $someNewEmployee = new SteelFactoryEmployee(); $someFactory = new SteelFactory(); $employmentDepartment = new EmploymentDepartment(); $employmentDepartment->hireNewEmployee($someFactory, $someNewEmployee);