Online PHP editor | rfc for aVrWS

@ 2020-12-08T09:21:14Z

<?php

class ProductBase {}
class Product extends ProductBase {}
class ProductBlank extends ProductBase {}

abstract class QuantityLineProductBase {
   /**
    * Contract: will always return some kind of ProductBase
    */
   abstract public function getProduct(): ProductBase;
}

class QuantityLineProductProduct extends QuantityLineProductBase {
   private Product $product;

   /**
    * Constructor doesn't need to obey substitution principles
    */
   public function __construct(Product $product) {
      $this->product = $product;
   }

   /**
    * Covariance of output; no violation
    */
   public function getProduct(): Product {
      return $this->product;
   }
}

class QuantityLineProductBlank extends QuantityLineProductBase {
   private ProductBlank $product;

   /**
    * Constructor accepting a different type; no violation
    */
   public function __construct(ProductBlank $product) {
      $this->product = $product;
   }
   /**
    * Covariance of output; no violation
    */
   public function getProduct(): ProductBlank {
      return $this->product;
   }
}

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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