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Ds\Set::first

(PECL ds >= 1.0.0)

Ds\Set::firstReturns the first value in the set

说明

public void Ds\Set::first ( void )

Returns the first value in the set.

参数

此函数没有参数。

返回值

The first value in the set.

错误/异常

UnderflowException if empty.

范例

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

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

以上例程的输出类似于:

int(1)
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