在foreach中获取先前的数组值 [英] get previous array values in foreach

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;
}

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