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@ 2018-06-29T13:49:12Z

<?php

class Foo implements JsonSerializable
{
    private $foo = 1;
    private $serializer;
    
    public function setSerializer(Closure $serializer) 
    {
        $this->serializer = $serializer;
    }
    
    public function jsonSerialize()
    {
        if (method_exists($this->serializer, 'call')) {
            return $this->serializer->call($this);
        }
        return call_user_func($this->serializer->bindTo($this, $this));
    }
}

class Serializer
{
    public function formatThisWay()
    {
        return function() {
            return $this->foo * 10;
        };
    }
    
    public function formatThatWay()
    {
        return function() {
            return ['foo' => $this->foo * 10];
        };
    }
}

$foo = new Foo;
$serializer = new Serializer;
$foo->setSerializer($serializer->formatThisWay());
echo json_encode($foo);
$foo->setSerializer($serializer->formatThatWay());
echo json_encode($foo);

Output for rfc.property-hooks, git.master, git.master_jit: Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/DBFJT on line 13 10{"foo":10}

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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