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<?php namespace Stripe\Util; use IteratorAggregate; use ArrayIterator; class Set implements IteratorAggregate { private $_elts; public function __construct($members = array()) { $this->_elts = array(); foreach ($members as $item) { $this->_elts[$item] = true; } } public function includes($elt) { return isset($this->_elts[$elt]); } public function add($elt) { $this->_elts[$elt] = true; } public function discard($elt) { unset($this->_elts[$elt]); } public function toArray() { return array_keys($this->_elts); } public function getIterator() { return new ArrayIterator($this->toArray()); } }