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@ 2015-11-07T16:55:05Z

<?php

final class Collection {
    /** @var string */
    private $type;
    
    private $objects = [];
    
    /**
     * @param string $type
     * @return Collection
     */ 
    public static function ofType($type)
    {
        $collection = new static();
        $collection->type = $type;
        
        $class = explode('\\', $type);
        
        class_alias(self::class, sprintf('%sCollection', array_pop($class)));
        
        return $collection;
    }
    
    public function add($object)
    {
        if (!$object instanceof $this->type) {
            throw new Exception(sprintf('Object of type [%s] is not [%s]', get_class($object), $this->type));
        }
        
        $this->objects[] = $object;
    }
    
    public function getAll()
    {
        return $this->objects;
    }
}

final class Person {}

$col = Collection::ofType(Person::class);
$col->add($person);

function parsePersonCollection(PersonCollection $coll)
{
    var_dump($coll->getAll());
}

parsePersonCollection($col);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $person in /in/6ELfj on line 43 Fatal error: Uncaught TypeError: get_class(): Argument #1 ($object) must be of type object, null given in /in/6ELfj:28 Stack trace: #0 /in/6ELfj(43): Collection->add(NULL) #1 {main} thrown in /in/6ELfj on line 28
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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