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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Stdlib;
use Serializable;
/**
* Serializable version of SplPriorityQueue
*
* Also, provides predictable heap order for datums added with the same priority
* (i.e., they will be emitted in the same order they are enqueued).
*/
class SplPriorityQueue extends \SplPriorityQueue implements Serializable
{
/**
* @var int Seed used to ensure queue order for items of the same priority
*/
protected $serial = PHP_INT_MAX;
/**
* Insert a value with a given priority
*
* Utilizes {@var $serial} to ensure that values of equal priority are
* emitted in the same order in which they are inserted.
*
* @param mixed $datum
* @param mixed $priority
* @return void
*/
public function insert($datum, $priority)
{
if (!is_array($priority)) {
$priority = array($priority, $this->serial--);
}
parent::insert($datum, $priority);
}
/**
* Serialize to an array
*
* Array will be priority => data pairs
*
* @return array
*/
public function toArray()
{
$array = array();
foreach (clone $this as $item) {
$array[] = $item;
}
return $array;
}
/**
* Serialize
*
* @return string
*/
public function serialize()
{
$clone = clone $this;
$clone->setExtractFlags(self::EXTR_BOTH);
$data = array();
foreach ($clone as $item) {
$data[] = $item;
}
return serialize($data);
}
/**
* Deserialize
*
* @param string $data
* @return void
*/
public function unserialize($data)
{
foreach (unserialize($data) as $item) {
$this->insert($item['data'], $item['priority']);
}
}
}