Ds\Sequence::first

    (PECL ds >= 1.0.0)

    Ds\Sequence::first — Returns 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.

    示例

    示例 #1 Ds\Sequence::first() example

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

    以上示例的输出类似于：

    int(1)

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