Home > Backend Development > PHP Tutorial > php实现多维数组中每个单元值(数字)翻倍的方法_PHP

php实现多维数组中每个单元值(数字)翻倍的方法_PHP

WBOY
Release: 2016-05-31 13:16:54
Original
915 people have browsed it

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;>
Copy after login

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;>
Copy after login

希望本文所述对大家的php程序设计有所帮助。

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template