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<?php
namespace Doctrine\Common\Collections;
use ArrayAccess;
use Closure;
/**
* The missing (SPL) Collection/Array/OrderedMap interface.
*
* A Collection resembles the nature of a regular PHP array. That is,
* it is essentially an <b>ordered map</b> that can also be used
* like a list.
*
* A Collection has an internal iterator just like a PHP array. In addition,
* a Collection can be iterated with external iterators, which is preferable.
* To use an external iterator simply use the foreach language construct to
* iterate over the collection (which calls {@link getIterator()} internally) or
* explicitly retrieve an iterator though {@link getIterator()} which can then be
* used to iterate over the collection.
* You can not rely on the internal iterator of the collection being at a certain
* position unless you explicitly positioned it before. Prefer iteration with
* external iterators.
*
* @psalm-template TKey of array-key
* @psalm-template T
* @template-extends ReadableCollection<TKey, T>
* @template-extends ArrayAccess<TKey, T>
*/
interface Collection extends ReadableCollection, ArrayAccess
{
/**
* Adds an element at the end of the collection.
*
* @param mixed $element The element to add.
* @psalm-param T $element
*
* @return true Always TRUE.
*/
public function add($element);
/**
* Clears the collection, removing all elements.
*
* @return void
*/
public function clear();
/**
* Removes the element at the specified index from the collection.
*
* @param string|int $key The key/index of the element to remove.
* @psalm-param TKey $key
*
* @return mixed The removed element or NULL, if the collection did not contain the element.
* @psalm-return T|null
*/
public function remove($key);
/**
* Removes the specified element from the collection, if it is found.
*
* @param mixed $element The element to remove.
* @psalm-param T $element
*
* @return bool TRUE if this collection contained the specified element, FALSE otherwise.
*/
public function removeElement($element);
/**
* Sets an element in the collection at the specified key/index.
*
* @param string|int $key The key/index of the element to set.
* @param mixed $value The element to set.
* @psalm-param TKey $key
* @psalm-param T $value
*
* @return void
*/
public function set($key, $value);
/**
* {@inheritdoc}
*
* @return Collection<mixed> A collection with the results of the filter operation.
* @psalm-return Collection<TKey, T>
*/
public function filter(Closure $p);
/**
* {@inheritdoc}
*
* @return Collection<mixed>[] An array with two elements. The first element contains the collection
* of elements where the predicate returned TRUE, the second element
* contains the collection of elements where the predicate returned FALSE.
* @psalm-return array{0: Collection<TKey, T>, 1: Collection<TKey, T>}
*/
public function partition(Closure $p);
}
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