How to calculate sum of field values ​​via PHP array

In the process of PHP program development, arrays are often used to store and manage data. Each element in the array is composed of a key and a value. In order to make statistics and processing of data more convenient, we can sum the values ​​of certain fields in the array.

The following will introduce how to calculate the sum of field values ​​​​through a PHP array.

First we need to create an array containing multiple elements, each element has a specified field value.

$students = array(
    0 => array("name" => "小明", "age" => 18, "score" => 90),
    1 => array("name" => "小红", "age" => 19, "score" => 85),
    2 => array("name" => "小李", "age" => 20, "score" => 95),
    3 => array("name" => "小张", "age" => 21, "score" => 89),
    4 => array("name" => "小王", "age" => 22, "score" => 92)
);

The above code creates an array containing 5 students. Each student has three field values: name, age, and score.

Next, we need to calculate the sum of student scores.

1. Use a for loop to traverse the array and accumulate the score of each student.

$sum = 0;
for($i = 0; $i <p>In the above code, a variable $sum is first defined to save the sum of scores, and then a for loop is used to traverse the array $students, and the score of each student is accumulated through the $sum variable ( score) field value. </p><p>The last line of code outputs the summation result. </p><ol start="2"><li>Use a foreach loop to traverse the array and accumulate the score value of each student. </li></ol><pre class="brush:php;toolbar:false">$sum = 0;
foreach($students as $stu){
    $sum += $stu['score'];
}
echo "学生的分数总和为：".$sum;

This code uses a foreach loop to traverse the array $students, $stu represents the value of each element (that is, an array). According to the score field value of each student, the score of each student is accumulated through the $sum variable.

The last line of code outputs the summation result.

3. Use the array_column function to obtain an array of fractional field values, and then use the array_sum function to sum it.

$scores = array_column($students, 'score');
$sum = array_sum($scores);
echo "学生的分数总和为：".$sum;

The first line of the above code uses the array_column function to obtain the array $scores of the score field (score) value from the array $students. Next, use the array_sum function to sum the values ​​in the $scores array and save the result in the variable $sum.

The last line of code outputs the summation result.

Summary:

Through the above three methods, we can easily calculate the sum of the field values ​​​​in the PHP array. In actual development, different methods can be selected for summation operations according to needs.

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