(PECL ds >= 1.0.0)
Ds\Queue::pop — Removes and returns the value at the front of the queue
此函数没有参数。
The removed value which was at the front of the queue.
UnderflowException if empty.
Example #1 Ds\Queue::pop() example
<?php
$queue = new \Ds\Queue();
$queue->push("a");
$queue->push("b");
$queue->push("c");
var_dump($queue->pop());
var_dump($queue->pop());
var_dump($queue->pop());
?>
以上例程的输出类似于：
string(1) "a" string(1) "b" string(1) "c"