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@ 2014-09-03T09:11:58Z

<?php

class GenericCollection
{
    private $className;

    private $items = [];

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

        $this->className = $className;
    }

    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 push($item)
    {
        $this->checkItemIsInstanceOfCorrectClass($item);
        array_push($this->items, $item);
    }

    public function unshift($item)
    {
        $this->checkItemIsInstanceOfCorrectClass($item);
        array_unshift($this->items, $item);
    }

    // other collection methods
}

class Foo {}
class Bar {}

$col = new GenericCollection(Foo::class);
$col->push(new Foo); // works
$col->push(new Bar); // exception

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught LogicException: Items in this collection must be instances of Foo in /in/LbDW5:21 Stack trace: #0 /in/LbDW5(32): GenericCollection->checkItemIsInstanceOfCorrectClass(Object(Bar)) #1 /in/LbDW5(50): GenericCollection->push(Object(Bar)) #2 {main} thrown in /in/LbDW5 on line 21
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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
2013-09-22 Anonymous classes - included in PHP 7

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