How to rewrite array values in PHP arrays

Sep 10, 2020 PHP beginners beginners PHP7

Purpose

• -Summary of how to update the values in the array contained in the array

Implementation environment

――I wrote this article while checking the operation of PHP on the following site. -https://paiza.io/ja

#Example

• -The process to update the value of the array contained in the array is described below.

  foreach (array A as & variable) {
      Variable ['index'] ='value you want to update';
  }
  

Specific example of rewriting the data of the existing index of the associative array

• -It is assumed that the associative array is stored in the array “$ infos”.

• -In the associative array, the product ID is stored in the index “id”, the product name is stored in the index “item_name”, and the price of the product excluding tax is stored in the index “price”.

• -How to withdraw the tax-excluded amount of the associative array index “price” stored in the array “$ infos”, calculate using the tax rate, and rewrite the tax-excluded amount of the associative array index “price” with the tax-included amount. Is described below.

  <? php
    
  $ infos [] = [
      'id' => 1,
      'item_name' =>'PHP book',
      'price' => '1000',
      ];;
        
  $ infos [] = [
      'id' => 2,
      'item_name' =>'Ruby book',
      'price' => '1200',
      ];;
        
  foreach ($ infos as & $ info) {
      $ info ['price'] * = 1.1;
  }
  
  var_dump ($ infos);
    
  ?>
  

Specific example of adding a new index to an associative array

• -It is assumed that the associative array is stored in the array “$ infos”.

• -In the associative array, the product ID is stored in the index “id”, the product name is stored in the index “item_name”, and the price of the product excluding tax is stored in the index “price”.

• -The method of withdrawing the tax-excluded amount of the index “price” of the associative array stored in the array “$ infos”, calculating using the tax rate, and adding the index “price_in_tax” to the associative array is described below.

  <? php
    
  $ infos [] = [
      'id' => 1,
      'item_name' =>'PHP book',
      'price' => '1000',
      ];;
        
  $ infos [] = [
      'id' => 2,
      'item_name' =>'Ruby book',
      'price' => '1200',
      ];;
        
  foreach ($ infos as & $ info) {
      $ info ['price_in_tax'] = $ info ['price'] * 1.1;
  }
  
  var_dump ($ infos);
    
  ?>
  

#References

• https://www.javadrive.jp/php/for/index10.html

foreach ($ items as & $ item) {
    $ item ['id'] = 123;
};