« SplPriorityQueue::current SplPriorityQueue::getExtractFlags » PHP Manual SplPriorityQueue Extracts a node from top of the heap and sift up SplPriorityQueue::extract (PHP 5 >= 5.3.0, PHP 7) SplPriorityQueue::extract — Extracts a node from top of the heap and sift up 说明 public SplPriorityQueue::extract ( void ) : mixed 参数 此函数没有参数。 返回值 The value or priority (or both) of the extracted node, depending on the extract flag.