What function is used to specify the sum of a column in a php array?

To specify the sum of a column in a php array, use the array_column() and array_sum() functions. Steps: 1. Use array_column() to obtain all elements of a specified column in the array. The syntax "array_column(array, 'specified column name')" will return a result array containing all elements; 2. Use array_sum() function to calculate the result. The sum of all elements in the array is enough, the syntax is "array_sum (result array)".

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

Use array_column to specify a column in the php array to sum. () and array_sum() functions.

• array_column() function can obtain all elements of a specified column in the array

• array_sum() function can calculate all elements in the array and

Implementation steps:

Step 1: Use the array_column() function to specify The value of a specified column in the array

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

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$user = array(
 &#39;0&#39; => array(&#39;id&#39; => 100, &#39;username&#39; => &#39;a1&#39;),
 &#39;1&#39; => array(&#39;id&#39; => 101, &#39;username&#39; => &#39;a2&#39;),
 &#39;2&#39; => array(&#39;id&#39; => 102, &#39;username&#39; => &#39;a3&#39;),
 &#39;3&#39; => array(&#39;id&#39; => 103, &#39;username&#39; => &#39;a4&#39;),
 &#39;4&#39; => array(&#39;id&#39; => 104, &#39;username&#39; => &#39;a5&#39;),
);
var_dump($user);
$id=array_column($user, &#39;id&#39;);
var_dump($id);
?>

Step 2: Use array_sum() to sum the result array

array_sum() function can calculate all the results in the specified array Sum of elements

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

Extended knowledge: array_product() function

array_sum() function can be calculated The sum of array elements, while the array_product() function can calculate the product of array elements.

<?php
$array= array(2,3,4);
echo &#39;2 * 3 * 4 = &#39;. array_product($array);

$array= array(3,4,5);
echo &#39;<br>3 * 4 * 5 = &#39;. array_product($array);

$array= array(1,2,3,4,5,6,7,8,9,10);
echo &#39;<br>1 * 2 * 3 *...* 9 * 10 = &#39;. array_product($array);
?>

Output result:

If there are non-numeric type elements in $array, then PHP will convert them into a Numeric value (implicit data type conversion), if the conversion fails, it will be treated as 0 value.

<?php
$array= array(2,"3.1",4);
echo &#39;2 * 3.1 * 4 = &#39;. array_product($array);

$array= array(3,"10.abc",5);
echo &#39;<br>3 * "10.abc" * 5 = 3 * 10 * 5 =&#39;. array_product($array);

$array= array(3,"hello",5);
echo &#39;<br>3 * "hello" * 5 = 3 * 0 * 5 =&#39;. array_product($array);
?>

• The string "3.1" will be converted into a decimal 3.1, so the product of the elements of the first array is 24.8.
  

• #The string "10abc" will be converted to the integer 10, so the product of the elements of the second array is 150.

• The string "hello" cannot be converted to an integer, so as a value of 0, the product of the elements of the third array is 0.

Output result:

Recommended learning: "PHP Video Tutorial"

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