在foreach中获取先前的数组值

本文介绍了在foreach中获取先前的数组值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的数组:

$arr = array("jan","feb","mar","apr","mei","jun","jul","agu","sep","okt","nov","des");

然后我做个foreach

then i do a foreach

foreach($arr as $ar){ echo $ar; }

将jan输出到des

that will output jan to des

我的问题是如何显示当前键中的先前值?

my question is how do i display the previous values in current key?

例如，当我进入二月时，我也想显示jan，当我进入七月时，我想显示jun等.

For example, when I get to feb, I want to display jan too, when I get to jul, i want to display jun, etc.

推荐答案

$previousValue = null; foreach($arr as $ar){ echo $ar; if($previousValue) { echo $previousValue; } $previousValue = $ar; }