PHP method to double the value (number) of each cell in a multi-dimensional array, multi-dimensional doubling_PHP tutorial

php method to double the value (number) of each cell in a multi-dimensional array, multi-dimensional doubling

The example in this article describes the method of doubling the value (number) of each cell in a multi-dimensional array in PHP. 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 that doubles the smallest cell value.

The code is as follows

<&#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;>

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

<&#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;>

I hope this article will be helpful to everyone’s PHP programming design.

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