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php实现多维数组中每个单元值(数字)翻倍的方法_php技巧

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Release: 2016-05-16 20:23:10
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本文实例讲述了php实现多维数组中每个单元值(数字)翻倍的方法。分享给大家供大家参考。具体分析如下:

前提:一个多维数组,它的每个最小单元值都为数字。
要求:写一个函数,将最小单元值翻倍。

代码如下

<&#63;php
$arr = array(1,3,'a'=>20,'b'=>array(2,4,6,'c'=>7));
function arr2($arr){
 foreach($arr as $key=>$v){
 if(!is_array($v)){
  $arr[$key] *= 2;
 }else{
  $arr[$key] = arr2($arr[$key]);
 }
 }
 return $arr;
}
echo "<pre class="brush:php;toolbar:false">";
print_r(arr2($arr));
&#63;>
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利用系统提供的函数来解决,方法如下:

<&#63;php
$arr = array(1,3,'a'=>20,'b'=>array(2,4,6,'c'=>7));
function t(&$arr){ 
 $arr *= 2;
}
echo "<pre class="brush:php;toolbar:false">";
array_walk_recursive($arr,'t');
print_r($arr);
&#63;>
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希望本文所述对大家的php程序设计有所帮助。

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