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@ 2023-10-05T00:44:03Z

<?php
class Car 
{
    protected array $tags;

    public function __get(string $prop): mixed
    {
        print("__get($prop) called");
        if (property_exists($this, $prop)) {
            return $this->{$prop};
        }
    }

    public function __set(string $prop, mixed $val): void
    {
        if (property_exists($this, $prop)) {
            $this->$prop = $val;
        }
    }
}

class CarMapper
{
    public function test(Car $car): void
    {
        echo 'そのままだとtrueになる'.PHP_EOL;
        var_dump(empty($car->tags)); // bool(true)

        echo '代入するとfalseになる'.PHP_EOL;
        $tags = $car->tags;
        var_dump(empty($tags)); // bool(false)
    }
}

$car = new Car();
$car->tags = ['tag1'];
$carMapper = new CarMapper();
$carMapper->test($car);

Output for git.master_jit, git.master, rfc.property-hooks: そのままだとtrueになる bool(true) 代入するとfalseになる __get(tags) calledbool(false)

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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