How to sum a certain column of a two-dimensional array in PHP

Summing steps: 1. Use array_column() to obtain all elements of the specified column in the two-dimensional array. The syntax "array_column(two-dimensional array, 'specified column name')" will return an array containing all the specified columns. The result array of elements; 2. Use array_sum() to sum the result array and calculate the sum of all elements in the result array. The syntax is "array_sum (result array)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php two-dimensional array Method for summing specified columns in:

Implementation idea:

• Take out the specified column in the two-dimensional array All elements of the column form a new array

• Find the sum of the new array

Implementation steps:

Step 1. Use array_column() to obtain all elements of the specified column in the two-dimensional array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(
  array(
    &#39;name&#39; => "小明",
    &#39;score&#39; => 85,
  ),
  array(
    &#39;name&#39; => "小华",
    &#39;score&#39; => 92,
  ),
  array(
    &#39;name&#39; => "霄晓",
    &#39;score&#39; => 100,
  ),
  array(
    &#39;name&#39; => "萧洁",
    &#39;score&#39; => 99,
  ),
  array(
    &#39;name&#39; => "赵峰",
    &#39;score&#39; => 96,
  )
);
var_dump($arr);
$score=array_column($arr, &#39;score&#39;);
var_dump($score);
?>

Step 2. Use array_sum() sums the result array

$score=array_column($arr, 'score');
var_dump($score);

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

Description:

• array_column() can return the value of a single column in the specified array; it will return a result array containing the value of the specified column (the array value is the value of the specified column).

array_column(array,column_key,index_key);

Parameters	Description
array	Required . Specifies the multidimensional array (record set) to use.
column_key	Required. The column whose value needs to be returned. Can be an integer index of a column of an index array, or a string key value of a column of an associative array. This parameter can also be NULL, in which case the entire array will be returned (very useful when used with the index_key parameter to reset the array key).
index_key	Optional. The column that is the index/key of the returned array.

Return value: Return an array. The value of the array is the value of a single column in the input array.​

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

 array_sum ( $arr )

If all elements of array arr are integers, return an integer value; if one or more of the values ​​are floating point numbers, return a floating point number.

If there are non-numeric elements in the array arr, PHP will try to convert them to a numeric value, and if the conversion fails, it will be treated as a 0 value. For example, the string "45" will be converted to the integer 45, and the string "12.4abc" will be converted to the decimal 12.4.

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