Stdlib/SplPriorityQueue.php

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Category
Zend  
Copyright
Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  
Package
Zend_Stdlib  

\SplPriorityQueue
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Package: Zend_Stdlib
SplPriorityQueue
PHP 5.2.X userland implementation of PHP's SplPriorityQueue
Implements
Children
\Zend_Stdlib_SplPriorityQueue

Constants

>VConstant  EXTR_DATA = 1
Extract data only
>VConstant  EXTR_PRIORITY = 2
Extract priority only
>VConstant  EXTR_BOTH = 3
Extract an array of ('data' => $value, 'priority' => $priority)

Properties

>VPropertyprotectedint $count = 0
Count of items in the queue
Default value0Details
Type
int
>VPropertyprotectedint $extractFlags = self::EXTR_DATA
Flag indicating what should be returned when iterating or extracting
Default valueself::EXTR_DATADetails
Type
int
>VPropertyprotectedbool|array $preparedQueue = false
Default valuefalseDetails
Type
bool | array
>VPropertyprotectedarray $queue = array()
All items in the queue
Default valuearray()Details
Type
array

Methods

methodpublic__construct() : void

Constructor

Creates a new, empty queue
methodpubliccompare(mixed $priority1, mixed $priority2) : int

Compare two priorities

Returns positive integer if $priority1 is greater than $priority2, 0 if equal, negative otherwise. Unused internally, and only included in order to retain the same interface as PHP's SplPriorityQueue.
Parameters
NameTypeDescription
$priority1mixed
$priority2mixed
Returns
TypeDescription
int
methodpubliccount() : int

Countable: return number of items composed in the queue

Returns
TypeDescription
int
methodpubliccurrent() : mixed

Iterator: return current item

Returns
TypeDescription
mixed
methodpublicextract() : \mixed;

Extract a node from top of the heap and sift up

Returns either the value, the priority, or both, depending on the extract flag.
Returns
TypeDescription
\mixed;
methodpublicinsert(mixed $value, mixed $priority) : void

Insert a value into the heap, at the specified priority

Parameters
NameTypeDescription
$valuemixed
$prioritymixed
methodpublicisEmpty() : bool

Is the queue currently empty?

Returns
TypeDescription
bool
methodpublickey() : mixed

Iterator: return current key

Returns
TypeDescription
mixedUsually an int or string
methodpublicnext() : void

Iterator: Move pointer forward

methodprotectedprepareQueue() : void

Prepare the queue for iteration and/or extraction

methodpublicrecoverFromCorruption() : void

Recover from corrupted state and allow further actions on the queue

Unimplemented, and only included in order to retain the same interface as PHP's SplPriorityQueue.
methodpublicrewind() : void

Iterator: Move pointer to first item

methodpublicsetExtractFlags(int $flags) : void

Set the extract flags

Defines what is extracted by SplPriorityQueue::current(), SplPriorityQueue::top() and SplPriorityQueue::extract(). - SplPriorityQueue::EXTR_DATA (0x00000001): Extract the data - SplPriorityQueue::EXTR_PRIORITY (0x00000002): Extract the priority - SplPriorityQueue::EXTR_BOTH (0x00000003): Extract an array containing both The default mode is SplPriorityQueue::EXTR_DATA.
Parameters
NameTypeDescription
$flagsint
methodprotectedsort() : void

Sort the queue

methodpublictop() : mixed

Return the value or priority (or both) of the top node, depending on the extract flag

Returns
TypeDescription
mixed
methodpublicvalid() : bool

Iterator: is the current position valid for the queue

Returns
TypeDescription
bool

\Zend_Stdlib_SplPriorityQueue
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Package: Zend_Stdlib
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).
Implements
Parent(s)
\SplPriorityQueue
Children
\Zend_EventManager_Filter_FilterIterator
Category
Zend  
Copyright
Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  

Properties

>VPropertyprotectedbool $isPhp53
Details
Type
bool
>VPropertyprotectedint $serial = PHP_INT_MAX

Seed used to ensure queue order for items of the same priority

Default valuePHP_INT_MAXDetails
Type
int

Methods

methodpublic__construct() : void

Constructor

methodpublicinsert(mixed $datum, mixed $priority) : void

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.
Parameters
NameTypeDescription
$datummixed
$prioritymixed
methodpublicserialize() : string

Serialize

Returns
TypeDescription
string
methodpublictoArray() : array

Serialize to an array

Array will be priority => data pairs
Returns
TypeDescription
array
methodpublicunserialize(string $data) : void

Deserialize

Parameters
NameTypeDescription
$datastring
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