Ds\Vector::first

(PECL ds >= 1.0.0)

Ds\Vector::firstReturns the first value in the vector

说明

public mixed Ds\Vector::first ( void )

Returns the first value in the vector.

参数

此函数没有参数。

返回值

The first value in the vector.

错误/异常

UnderflowException if empty.

范例

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

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

以上例程的输出类似于:

int(1)
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