2.3/Collection_8php_source.html

 <?php
 namespace Elgg\Structs;

 use Countable;
 use Iterator;

 interface Collection extends Countable, Iterator {

     public function filter(callable $filter);

     public function contains($item);

     public function map(callable $mapper);
 }
$item
if(!$items) $item
Definition: delete.php:17

Elgg\Structs\Collection\map
map(callable $mapper)
Take items of the collection and return a new collection with all the items having the $mapper applie...

Elgg\Structs

$filter
if(!$vars['title']&&$vars['title']!==false) if(isset($vars['filter_override'])) if(!isset($vars['filter'])&&elgg_is_logged_in()&&$context) $filter
Definition: content.php:62

Countable

Elgg\Structs\Collection\contains
contains($item)
Returns true iff the item is in this collection at least once.

Elgg\Structs\Collection
A read-only interface to a (possibly mutable) group of items.
Definition: Collection.php:33

Iterator

use
http free of to any person obtaining a copy of this software and associated documentation to deal in the Software without including without limitation the rights to use
Definition: MIT-LICENSE.txt:5

Elgg\Structs\Collection\filter
filter(callable $filter)
Returns a new collection only containing the elements which pass the filter.