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SplPriorityQueue.php
01 <?php
02 /**
03 * Zend Framework (http://framework.zend.com/)
04 *
05 * @link http://github.com/zendframework/zf2 for the canonical source repository
06 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
07 * @license http://framework.zend.com/license/new-bsd New BSD License
08 */
09
10 namespace Zend\Stdlib;
11
12 use Serializable;
13
14 /**
15 * Serializable version of SplPriorityQueue
16 *
17 * Also, provides predictable heap order for datums added with the same priority
18 * (i.e., they will be emitted in the same order they are enqueued).
19 */
20 class SplPriorityQueue extends \SplPriorityQueue implements Serializable
21 {
22 /**
23 * @var int Seed used to ensure queue order for items of the same priority
24 */
25 protected $serial = PHP_INT_MAX;
26
27 /**
28 * Insert a value with a given priority
29 *
30 * Utilizes {@var $serial} to ensure that values of equal priority are
31 * emitted in the same order in which they are inserted.
32 *
33 * @param mixed $datum
34 * @param mixed $priority
35 * @return void
36 */
37 public function insert($datum, $priority)
38 {
39 if (!is_array($priority)) {
40 $priority = array($priority, $this->serial--);
41 }
42 parent::insert($datum, $priority);
43 }
44
45 /**
46 * Serialize to an array
47 *
48 * Array will be priority => data pairs
49 *
50 * @return array
51 */
52 public function toArray()
53 {
54 $array = array();
55 foreach (clone $this as $item) {
56 $array[] = $item;
57 }
58 return $array;
59 }
60
61 /**
62 * Serialize
63 *
64 * @return string
65 */
66 public function serialize()
67 {
68 $clone = clone $this;
69 $clone->setExtractFlags(self::EXTR_BOTH);
70
71 $data = array();
72 foreach ($clone as $item) {
73 $data[] = $item;
74 }
75
76 return serialize($data);
77 }
78
79 /**
80 * Deserialize
81 *
82 * @param string $data
83 * @return void
84 */
85 public function unserialize($data)
86 {
87 foreach (unserialize($data) as $item) {
88 $this->insert($item['data'], $item['priority']);
89 }
90 }
91 }
92