Ds\PriorityQueue::peek

(PECL ds >= 1.0.0)

Ds\PriorityQueue::peekReturns the value at the front of the queue

说明

public mixed Ds\PriorityQueue::peek ( void )

Returns 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

Example #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"
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