Become Zend Certified

Prepare for the ZCE exam using our quizzes (web or iPad/iPhone). More info...

When you're ready get 7.5% off your exam voucher using voucher CJQNOV23 at the Zend Store

The SplPriorityQueue class

Introduction

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

SplPriorityQueue implements Iterator , Countable {

/* Methods */

__construct ( void )

int compare ( mixed $priority1 , mixed $priority2 )

int count ( void )

mixed current ( void )

mixed extract ( void )

void insert ( mixed $value , mixed $priority )

bool isEmpty ( void )

mixed key ( void )

void next ( void )

void recoverFromCorruption ( void )

void rewind ( void )

void setExtractFlags ( int $flags )

mixed top ( void )

bool valid ( void )

}

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::insert - Inserts an element in the queue by sifting it up.
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