How to sum each field in a php array

With the development of the Internet, Web development has become an indispensable tool. As a language widely used in web development, PHP is favored by more and more developers. In the PHP development process, it is often necessary to perform various operations on arrays, among which summing array fields is a very common requirement. Therefore, this article will introduce how to use PHP to implement the sum operation of array fields.

First, we need to create a sample array to facilitate subsequent operations. Suppose we have an array containing multiple personnel information, as shown below:

$people = array(
    array("name"=>"张三", "age"=>20, "salary"=>5000),
    array("name"=>"李四", "age"=>25, "salary"=>8000),
    array("name"=>"王五", "age"=>30, "salary"=>10000),
    array("name"=>"赵六", "age"=>35, "salary"=>12000)
);

In this example array, each array element represents the information of a person, including three fields: name, age and salary. .

Next, we need to use a loop in PHP to traverse the array and perform a field sum operation for each array element. The following is a sample code implemented using a for loop:

$totalSalary = 0;   // 初始化总工资为0

for($i = 0; $i < count($people); $i++){
    $totalSalary += $people[$i][&#39;salary&#39;];   // 累加当前人员工资到总工资中
}

echo "所有人员的总工资为：" . $totalSalary;

In the above code, we use a variable named $totalSalary to store the total salary of all personnel, with an initial value of 0. Then use a for loop to traverse the array $people, and add the salary field of the current person to the $totalSalary variable each time. Finally, use the echo statement to output the total salary of all personnel.

In addition to using the for loop, we can also use the foreach loop to traverse the array and perform sum operations. The code using the foreach loop is relatively concise, as shown below:

$totalSalary = 0;   // 初始化总工资为0

foreach($people as $person){
    $totalSalary += $person['salary'];   // 累加当前人员工资到总工资中
}

echo "所有人员的总工资为：" . $totalSalary;

Compared with the for loop, the code using the foreach loop is more concise and clear. By assigning the array elements to the $person variable, we can directly use $person['salary'] to get the salary field of the current person and accumulate it into the $totalSalary variable.

In actual development, it is often necessary to perform sum operations on multiple fields. For example, in the example array, we may also need to sum the age field and salary field separately. In order to achieve this goal, we can use a function called array_column to first take out the specified field and then perform the sum operation. The following is a sample code that sums the age and salary fields respectively:

$salaryList = array_column($people, 'salary');   // 获取所有人员的工资字段，并存储到$salaryList数组中
$totalSalary = array_sum($salaryList);   // 对$salaryList数组中的所有元素进行求和操作

$ageList = array_column($people, 'age');   // 获取所有人员的年龄字段，并存储到$ageList数组中
$totalAge = array_sum($ageList);   // 对$ageList数组中的所有元素进行求和操作

echo "所有人员的总工资为：" . $totalSalary . "<br>";
echo "所有人员的平均年龄为：" . round($totalAge/count($people));

In the above code, we first use the array_column function to obtain the salary and age fields of all personnel respectively, and store them in $salaryList and $ ageList in two arrays. Then, use the array_sum function to sum all the elements in the two arrays and store the results in the $totalSalary and $totalAge variables respectively. Finally, the echo statement is used to output the total salary and average age of all personnel.

In short, in PHP development, summing array fields is a very common operation. By using tools such as for loop, foreach loop, array_column function and array_sum function, we can easily implement various summation operations, thereby centrally managing array data and improving development efficiency.

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