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Ds\Sequence::shift

(PECL ds >= 1.0.0)

Ds\Sequence::shift — Removes and returns the first value

说明

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

Removes and returns the first value.

参数

此函数没有参数。

返回值

The first value, which was removed.

错误／异常

UnderflowException if empty.

示例

示例 #1 Ds\Sequence::shift() example

<?php
$sequence = new \Ds\Vector(["a", "b", "c"]);

var_dump($sequence->shift());
var_dump($sequence->shift());
var_dump($sequence->shift());
?>

以上示例的输出类似于：

string(1) "a"
string(1) "b"
string(1) "c"