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@ 2013-07-29T10:09:08Z

<?php
/**
 * Advanced PHP Interface Example: Traversable and Countable extended
 *
 * As Traversable is an internal class but PHP interfaces allow to extend
 * from multiple interfaces, it is possible to create your own internal
 * type (here based on Traversable) and base another non-internal sub-type 
 * on it (here based on IteratorAggregate).
 *
 * @link http://wpkrauts.com/2013/how-to-build-flexible-php-interfaces/
 */

interface CountableTraversable 
    extends Traversable, Countable
{
}

interface CountableTraversableAggregate 
    extends CountableTraversable, IteratorAggregate
{
}

class Widgets implements CountableTraversableAggregate
{
    private $widgets = array();
    
    function getIterator() 
    {
        return new ArrayIterator($this->widgets);
    }

    function count() 
    {
        return count($this->widgets);
    }
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of Widgets::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/6hpLr on line 32 Deprecated: Return type of Widgets::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/6hpLr on line 27

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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