The SplPriorityQueue class

(PHP 5 >= 5.3.0, PHP 7)

简介

The SplPriorityQueue class provides the main functionalities of a prioritized queue, implemented using a max heap.

Note: The order of elements with identical priority is undefined. It may differ from the order in which they have been inserted.

SplPriorityQueue implements Iterator , Countable {

/* 方法 */

public __construct ( void )

public compare ( mixed $priority1 , mixed $priority2 ) : int

public count ( void ) : int

public current ( void ) : mixed

public extract ( void ) : mixed

public getExtractFlags ( void ) : int

public insert ( mixed $value , mixed $priority ) : bool

public isCorrupted ( void ) : bool

public isEmpty ( void ) : bool

public key ( void ) : mixed

public next ( void ) : void

public recoverFromCorruption ( void ) : void

public rewind ( void ) : void

public setExtractFlags ( int $flags ) : void

public top ( void ) : mixed

public valid ( void ) : bool

}

SplPriorityQueue::compare — Compare priorities in order to place elements correctly in the heap while sifting up
SplPriorityQueue::__construct — Constructs a new empty queue
SplPriorityQueue::count — Counts the number of elements in the queue
SplPriorityQueue::current — Return current node pointed by the iterator
SplPriorityQueue::extract — Extracts a node from top of the heap and sift up
SplPriorityQueue::getExtractFlags — Get the flags of extraction
SplPriorityQueue::insert — Inserts an element in the queue by sifting it up
SplPriorityQueue::isCorrupted — Tells if the priority queue is in a corrupted state
SplPriorityQueue::isEmpty — Checks whether the queue is empty
SplPriorityQueue::key — Return current node index
SplPriorityQueue::next — Move to the next node
SplPriorityQueue::recoverFromCorruption — Recover from the corrupted state and allow further actions on the queue
SplPriorityQueue::rewind — Rewind iterator back to the start (no-op)
SplPriorityQueue::setExtractFlags — Sets the mode of extraction
SplPriorityQueue::top — Peeks at the node from the top of the queue
SplPriorityQueue::valid — Check whether the queue contains more nodes