Extracts a node from top of the heap and sift up.

SplPriorityQueue::extract

(PHP 5 >= 5.3.0)

SplPriorityQueue::extract — Extracts a node from top of the heap and sift up.

mixed SplPriorityQueue::extract ( void )

This function has no parameters.

The value or priority (or both) of the extracted node, depending on the extract flag.