Online PHP editor | rfc for 9kY9Y

@ 2014-09-03T10:02:37Z

<?php

class GenericCollection extends \SplDoublyLinkedList
{
   private $className;

   public function __construct($className, $data = [])
   {
      if (!class_exists($className)) {
         throw new \LogicException('Invalid class name: ' . $className);
      }

      $this->className = $className;
      $this->items = new \SplDoublyLinkedList;

      foreach ($data as $item) {
         $this->push($item);
      }
   }

   private function checkItemIsInstanceOfCorrectClass($item)
   {
      if (!$item instanceof $this->className) {
         throw new \LogicException('Items in this collection must be instances of ' . $this->className);
      }
   }

   public function getClassName()
   {
      return $this->className;
   }

   public function add($item)
   {
      $this->checkItemIsInstanceOfCorrectClass($item);
      parent::add($item);
   }

   public function push($item)
   {
      $this->checkItemIsInstanceOfCorrectClass($item);
      parent::push($item);
   }

   public function unshift($item)
   {
      $this->checkItemIsInstanceOfCorrectClass($item);
      parent::unshift($item);
   }

   public function offsetSet($offset, $item)
   {
      $this->checkItemIsInstanceOfCorrectClass($item);
      parent::offsetSet($offset, $item);
   }
}

class Foo {}
class Bar {}

$col = new GenericCollection(Foo::class, [new Foo, new Foo]);
$col->push(new Foo);
$col[] = new Foo;

foreach ($col as $foo) {
    var_dump($foo);
}

$col->push(new Bar);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Declaration of GenericCollection::add($item) must be compatible with SplDoublyLinkedList::add(int $index, mixed $value): void in /in/9kY9Y on line 33
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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