Collection.php

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<?php

namespace SAML2\Utilities;

interface Collection extends \ArrayAccess, \Countable, \IteratorAggregate
{
    public function add($element);

    public function getOnlyElement();

    public function first();

    public function last();

    public function map(\Closure $function);

    public function filter(\Closure $filterFunction);

    public function get($key);

    public function remove($element);

    public function set($key, $value);
}