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@ 2015-06-13T06:34:01Z

<?php

class A implements JsonSerializable
{
    protected $a = array();

    public function __construct()
    {
        $this->a = array( new B, new B );
    }

    public function jsonSerialize()
    {
        return $this->a;
    }
}

class B implements JsonSerializable
{
    protected $b = array( 'foo' => 'bar' );

    public function jsonSerialize()
    {
        return $this->b;
    }
}


$foo = new A();

$json = json_encode($foo);

var_dump($json);

class Example implements JsonSerializable
{
    private $_data = array();

    public function getData($key = null)
    {
        if (is_null($key)) {
            return $this->_data;
        }

        if (array_key_exists($key, $this->_data)) {
            return $this->_data[$key];
        }

        return null;
    }

    public function setData($key, $value = null)
    {
        if (is_array($key)) {
            if (!is_null($value)) {
                throw new Exception('When setting data in bulk, the value argument must be null');
            }

            $this->_data = $key;

            return $this;
        }

        $this->_data[(string)$key] = $value;

        return $this;
    }

    public function jsonSerialize()
    {
        return $this->_data;
    }
}

$example = new Example();
$example->setData(array(
    'first' => 1,
    'second' => 2,
))->setData('third', 3);

var_dump(json_encode($example));

$example2 = new Example();
$example3 = new Example();

$example2->setData(array(
    'banana' => 'yellow',
));
$example3->setData(array(
    'apple' => 'red',
));

$arr = array(
    $example,
    $example2,
    $example3,
);

var_dump(json_encode($arr));

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of A::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5A0i0 on line 12 Deprecated: Return type of B::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5A0i0 on line 22 string(29) "[{"foo":"bar"},{"foo":"bar"}]" Deprecated: Return type of Example::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5A0i0 on line 69 string(32) "{"first":1,"second":2,"third":3}" string(70) "[{"first":1,"second":2,"third":3},{"banana":"yellow"},{"apple":"red"}]"

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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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