Online PHP editor | rfc for Hc1tm

@ 2021-06-08T19:13:31Z

<?php

// cet exemple est issue de la documentation https://www.php.net/manual/fr/language.oop5.variance.php

declare(strict_types=1);

class Food {}

// la classe AnimalFood hérite de Food
class AnimalFood extends Food {}

abstract class Animal
{
    protected string $name;

    public function __construct(string $name)
    {
        $this->name = $name;
    }

    // Initialement un animal mange de la nouriture animale.
    public function eat(AnimalFood $food)
    {
        echo $this->name . " eats " . get_class($food);
    }
}

class Dog extends Animal
{
    // Puisque la nouriture animale est avant tout de la nouriture, alors il est possible d'élargir le choix
    // en précisant juste nouriture. C'est toujours valide :) Le chien ne s'en plaindra pas.
    // Par contre un poisson... ne mangera probablement pas une côte de boeuf... 
    // Il faut pouvoir conserver le comportement original, et garantir la nouriture appropriée.
    // Ceci s'appelle la contravariance.
    public function eat(Food $food) {
        echo $this->name . " eats " . get_class($food);
    }
}

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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