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@ 2015-11-02T20:28:21Z

<?php

interface MyInterface {
    public function get(): int;
    public function set(int $value);
}

class Factory {
    
    private $instance = null;
    
    public function getInstance(): MyInterface
    {
        if ($this->instance === null) {
            $this->instance = new class() {
                private $var;
                public function get(): int {
                    return $this->var;
                }
                public function set(int $value) {
                    $this->var = $value;
                }
            };
        }
        return $this->instance;
    }
}

function display(MyInterface $object)
{
    var_dump($object->get());
}

$factory = new Factory();
$o = $factory->getInstance();
$o->set(5);
$o2 = $factory->getInstance();

display($o2);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: Factory::getInstance(): Return value must be of type MyInterface, class@anonymous returned in /in/ogcL0:25 Stack trace: #0 /in/ogcL0(35): Factory->getInstance() #1 {main} thrown in /in/ogcL0 on line 25
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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