Ds\PriorityQueue::peek
(PECL ds >= 1.0.0)
Ds\PriorityQueue::peek — Returns the value at the front of the queue
说明
public Ds\PriorityQueue::peek(): mixedReturns the value at the front of the queue, but does not remove it.
参数
此函数没有参数。
返回值
The value at the front of the queue.
错误／异常
UnderflowException if empty.
范例
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());
?>
以上例程的输出类似于：
string(1) "b"
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/ds-priorityqueue.peek.php