Returns the first value in the vector

Ds\Vector::first

(PECL ds >= 1.0.0)

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

說明

public Ds\Vector::first(): mixed

Returns the first value in the vector.

參數

此函式沒有參數。

返回值

The first value in the vector.

錯誤/異常

UnderflowException if empty.

範例

示例 #1 Ds\Vector::first() example

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

以上例程的輸出類似於:

int(1)

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