SplPriorityQueue
PHP Manual

SplPriorityQueue::key

(PHP 5 >= 5.3.0, PHP 7)

SplPriorityQueue::keyReturn current node index

Description

public mixed SplPriorityQueue::key ( void )

This function returns the current node index

Parameters

This function has no parameters.

Return Values

The current node index.


SplPriorityQueue
PHP Manual