Double the value of each cell in php multidimensional array

This article mainly introduces the method of doubling the value (number) of each unit in a multi-dimensional array in PHP. It involves the skills of operating arrays in PHP. Friends who need it can refer to it.

The examples in this article describe PHP A method to double the value (number) of each cell in a multidimensional array. Share it with everyone for your reference. The specific analysis is as follows:

Premise: A multi-dimensional array, each of its smallest unit values ​​is a number.
Requirement: Write a function to double the minimum unit value.

The code is as follows

<?php
$arr = array(1,3,&#39;a&#39;=>20,&#39;b&#39;=>array(2,4,6,&#39;c&#39;=>7));
function arr2($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));
?>

Use the functions provided by the system to solve the problem. The method is as follows:

<?php
$arr = array(1,3,&#39;a&#39;=>20,&#39;b&#39;=>array(2,4,6,&#39;c&#39;=>7));
function t(&$arr){ 
 $arr *= 2;
}
echo "<pre class="brush:php;toolbar:false">";
array_walk_recursive($arr,&#39;t&#39;);
print_r($arr);
?>

Summary: The above is the entire content of this article. I hope it will be helpful to everyone's study.

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