Removes and returns the value with the highest priority

# Ds\PriorityQueue::pop

(PECL ds >= 1.0.0)

Ds\PriorityQueue::pop — Removes and returns the value with the highest priority

### 说明

public function Ds\PriorityQueue::pop(): mixed

Removes and returns the value at the front of the queue, ie. the value with the highest priority.

> 注意:

> Values with equal priority fall back to FIFO (first in first out).

### 参数

此函数没有参数。

### 返回值

The removed value which was at the front of the queue.

### 错误／异常

UnderflowException if empty.

### 示例

示例 #1 Ds\PriorityQueue::pop() example

    <?php
    $queue = new \Ds\PriorityQueue();

    $queue->push("a",  5);
    $queue->push("b", 15);
    $queue->push("c", 10);

    print_r($queue->pop());
    print_r($queue->pop());
    print_r($queue->pop());
    ?>

以上示例的输出类似于：

    string(1) "a"
    string(1) "b"
    string(1) "c"

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