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@ 2020-02-13T07:46:08Z

<?php

interface ParentInterface {}

interface ChildInterface extends ParentInterface {}

interface OriginalHandlerInterface
{
    public function handle(ParentInterface $a): string;
}

interface AnotherHandlerInterface
{ 
    public function handle(ChildInterface $a): string;
}

class RegularImplementor implements AnotherHandlerInterface
{
    public function handle(ChildInterface $a): string {
        return class_name($a);
    }
}

class ContravariantImplementor implements AnotherHandlerInterface
{
    public function handle(ParentInterface $a): string {
        return class_name($a);
    }
}

class OriginalImplementor implements OriginalHandlerInterface
{
    public function handle(ParentInterface $a) : string
    {
        return class_name($a);
    }
}


// this will error out
class WrongOriginalImplementor implements OriginalHandlerInterface
{
    public function handle(ChildInterface $a) : string
    {
        return class_name($a);
    }
}

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Declaration of WrongOriginalImplementor::handle(ChildInterface $a): string must be compatible with OriginalHandlerInterface::handle(ParentInterface $a): string in /in/sZ9XB on line 43
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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