(PECL ds >= 1.0.0)
Ds\PriorityQueue::peek — Returns the value at the front of the queue
Returns the value at the front of the queue, but does not remove it.
此函數(shù)沒有參數(shù)。
The value at the front of the queue.
UnderflowException if empty.
示例 #1 Ds\PriorityQueue::peek() example
<?php
$queue = new \Ds\PriorityQueue();
$queue->push("a", 5);
$queue->push("b", 15);
$queue->push("c", 10);
var_dump($queue->peek());
?>
以上例程的輸出類似于：
string(1) "b"