How to sum a column of a multidimensional array in php

Sum method: 1. Use array_column() to obtain all elements of a specified column in a multi-dimensional array. The syntax "rray_column(array, 'specified column name')" will return a result array containing all elements; 2. Use "array_sum (result array)" to calculate the sum of all elements in the result array.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php for multi-dimensional arrays Method of summing a certain column

In PHP, you can use array_column() and array_sum() to sum a certain column of a multi-dimensional array.

1. Use array_column() to obtain all elements of a specified column

array_column() can return the value of a single column in the specified array; it will be returned An array, the array value is the value of a specified column.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(
  array(
    &#39;month&#39; => "1",
    &#39;days&#39; => 31,
  ),
  array(
    &#39;month&#39; => "2",
    &#39;days&#39; => 28,
  ),
  array(
    &#39;month&#39; => "3",
    &#39;days&#39; => 31,
  ),
  array(
    &#39;month&#39; => "4",
    &#39;days&#39; => 30,
  ),
  array(
    &#39;month&#39; => "5",
    &#39;days&#39; => 31,
  )
);
var_dump($arr);
$days=array_column($arr, &#39;days&#39;);
var_dump($days);
?>

2. Use array_sum() to sum the result array

array_sum() function can calculate all elements in the specified array The sum of

echo "多维数组中days列的和：".array_sum($days);

we use a calculator to check:

Recommended learning: "PHP Video Tutorial》

The above is the detailed content of How to sum a column of a multidimensional array in php. For more information, please follow other related articles on the PHP Chinese website!