Ds\Vector::first

(PECL ds >= 1.0.0)

Ds\Vector::first — Returns the first value in the vector

说明

public Ds\Vector::first ( void ) : mixed

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
$vector = new \Ds\Vector([1, 2, 3]);
var_dump($vector->first());
?>

以上例程的输出类似于：

int(1)
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