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@ 2019-12-01T19:14:54Z

<?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(SteelFactoryEmployee $employee): bool
    {
        return true;
    }
}

class CarsFactory implements Factory
{
    public function hire(CarsFactoryEmployee $employee): bool
    {
        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);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Declaration of SteelFactory::hire(SteelFactoryEmployee $employee): bool must be compatible with Factory::hire(Employee $employee): bool in /in/RtM7Z on line 15
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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