How to calculate the sum of array elements using array_sum function in PHP

In PHP, array is a common data type, and the summation operation of array elements is also frequently used. PHP provides a built-in function array_sum that can easily calculate the sum of array elements. The following will introduce how to use the array_sum function to implement the sum of array elements.

First, we need to create an array containing multiple values. Suppose we have an array $numbers whose elements are [2, 4, 6, 8, 10], and we need to calculate the sum of these numbers.

PHP's array_sum function can directly sum the array elements, and the returned result is a numerical type. In this example, we can use the following code to implement array sum:

$numbers = array(2, 4, 6, 8, 10);
$sum = array_sum($numbers);
echo "数组元素的和为：" . $sum;

In the code, we first define an array $numbers containing multiple values, and then use the array_sum function to sum the array, And save the result in the variable $sum. Finally, use the echo function to output the result.

The output result is: the sum of the array elements is: 30

In addition to the one-dimensional array in the above example, the array_sum function can also sum multi-dimensional arrays. In multidimensional arrays, the array_sum function only sums the elements of the last dimension.

Suppose now we have a two-dimensional array $numbers whose elements are [[1, 2, 3], [4, 5, 6], [7, 8, 9]], we need to calculate these We can use the following code to realize the sum of values:

$numbers = array(
    array(1, 2, 3),
    array(4, 5, 6),
    array(7, 8, 9)
);
$sum = array_sum(array_map('array_sum', $numbers));
echo "二维数组元素的和为：" . $sum;

In the code, we use the array_map function to save the summation result of each sub-array in a new array, and then use the array_sum function to perform the summation on the result array. Sum, and finally save the result in the variable $sum.

The output result is: the sum of the two-dimensional array elements is: 45

In addition to the usage introduced above, there are several things to note about the array_sum function:

1. If there are non-numeric elements in the array, the array_sum function will treat them as 0.
2. If there are no elements in the array, the array_sum function will return 0.
3. If the elements in the array cannot be cast to a numeric type, a warning will be returned.

In short, when calculating the sum of array elements, the array_sum function provided by PHP is a very convenient and practical tool, which can avoid the tedious operation of manually traversing array elements for summation.

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