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PHP - Manual: Ds\Sequence::first

2024-11-14

Ds\Sequence::first

(PECL ds >= 1.0.0)

Ds\Sequence::firstReturns the first value in the sequence

说明

abstract public Ds\Sequence::first(): mixed

Returns the first value in the sequence.

参数

此函数没有参数。

返回值

The first value in the sequence.

错误/异常

UnderflowException if empty.

范例

示例 #1 Ds\Sequence::first() example

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

以上例程的输出类似于:

int(1)
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官方地址:https://www.php.net/manual/en/ds-sequence.first.php

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