How to sum the elements in a php array

How to sum the elements in the php array: 1. Use a loop to traverse the sum. First define an array `$array`, and then define a variable `$sum` with an initial value of 0. Next Use `foreach` to loop through each element in the array, add each element to `$sum`, and finally output the value of `$sum`; 2. Use PHP built-in function array_sum(), use `array_sum()` The function sums the elements in the array `$array`; 3. Use recursive functions to sum, etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a server-side scripting language widely used for web development. It provides rich features and flexible syntax, allowing developers to quickly build dynamic web pages and web applications. An array in PHP is a special variable type used to store multiple values ​​and each value can be accessed by index or associated key.

During the development process, we often need to perform sum operations on the elements in the array. This article will introduce several common methods of summing elements in PHP arrays.

1. Use loop traversal and summation

The simplest method is to use a loop to traverse the array and add each element to an accumulation variable to obtain the array The sum of all elements in . The following is a sample code:

$array = [1, 2, 3, 4, 5];
$sum = 0;
foreach ($array as $value) {
$sum += $value;
}
echo "数组的和为：".$sum;

This code first defines an array `$array`, and then defines a variable `$sum` with an initial value of 0. Next, use `foreach` to loop through each element in the array, add each element to `$sum`, and finally output the value of `$sum`.

2. Use the PHP built-in function array_sum()

PHP provides a built-in function `array_sum()` to find the sum of the elements in an array. The following is a sample code:

$array = [1, 2, 3, 4, 5];
$sum = array_sum($array);
echo "数组的和为：".$sum;

In this code, we directly use the `array_sum()` function to sum the elements in the array `$array` and assign the result to the variable `$sum`, Then output the value of `$sum`.

3. Use recursive function for summation

Using recursive function is also a method of summing. A recursive function is a function that calls itself. It is usually used for Solve some problems that require multiple iterations. The following is a sample code:

$array = [1, 2, 3, 4, 5];
function arraySum($array) {
if (count($array) == 1) {
return $array[0];
} else {
return $array[0] + arraySum(array_slice($array, 1));
}
}
$sum = arraySum($array);
echo "数组的和为：".$sum;

In this code, we first define a recursive function `arraySum()`, which accepts an array as a parameter. Inside the function, we first check whether the length of the array is 1, and if so, directly return the only element of the array; otherwise, we compare the first element of the array with the first element after removing the first element using the `array_slice()` function Add the subarrays and then call the `arraySum()` function again. Finally, the result of adding all elements is returned to the variable `$sum`, and then the value of `$sum` is output.

Through the above three methods, we can easily sum the elements in the PHP array. Developers can choose the method that suits them based on specific needs to obtain the desired results.

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