Ds\Deque::first

(PECL ds >= 1.0.0)

Ds\Deque::firstReturns the first value in the deque

说明

public mixed Ds\Deque::first ( void )

Returns the first value in the deque.

参数

此函数没有参数。

返回值

The first value in the deque.

错误/异常

UnderflowException if empty.

范例

Example #1 Ds\Deque::first() example

<?php
$deque 
= new \Ds\Deque([123]);
var_dump($deque->first());
?>

以上例程的输出类似于:

int(1)
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