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; $i < count($students); $i++){
    $sum += $students[$i]['score'];
}
echo "学生的分数总和为：".$sum;

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.

The last line of code outputs the summation result.

2. Use a foreach loop to traverse the array and accumulate the score value of each student.

$sum = 0;
foreach($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.

The above is the detailed content of How to calculate sum of field values ​​via PHP array. For more information, please follow other related articles on the PHP Chinese website!