update : 2015.11.03
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Extracts a node from top of the heap and sift up.
SplHeap
PHP Manual

SplHeap::extract

(PHP 5 >= 5.3.0)

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

설명

public mixed SplHeap::extract ( void )

인수

이 함수는 인수가 없습니다.

반환값

The value of the extracted node.

오류/예외

Throws RuntimeException when the data-structure is empty.

SplHeap
PHP Manual