PHP function introduction—array_sum(): Calculate the sum of all elements of an array

PHP function introduction—array_sum(): Calculate the sum of all elements of an array

In PHP, array is a very commonly used data structure, often used to store a set of related data. When working with arrays, you often need to calculate the sum of all elements in the array. In order to facilitate developers to perform such calculations, PHP provides a built-in function-array_sum().

The array_sum() function is to calculate the sum of all elements in the array and return the calculation result. It works for all types of numeric arrays, whether it is an array of integers or arrays of floating point numbers. Note that if the array contains an element of non-numeric type, the element will be ignored.

Below, we will introduce the use of array_sum() function in detail and give some sample codes.

Syntax:
array_sum(array $array): number

Parameter description:

• $array: The array whose element sum is to be calculated. Must be a numeric array.

Return value:

• Returns the sum of all elements in the array. If the array is empty, 0 is returned.

Sample code:

<?php
// 示例数组
$numbers = [1, 2, 3, 4, 5];

// 计算数组所有元素的和
$sum = array_sum($numbers);

// 输出结果
echo "数组的和为：$sum";
?>

In the above code, we define a sample array $numbers, which contains a set of numbers. Then, we call the array_sum() function, passing $numbers as a parameter. The function returns the sum of all elements in the array $numbers and assigns it to the variable $sum.

Finally, we print out the calculated array sum through the output function echo. In the example code, the sum of the array $numbers is 15, so the output result is "The sum of the array is: 15".

It should be noted that if the array is empty, that is, it does not contain any elements, the array_sum() function will return 0. This is because there are no elements involved in the calculation, so the result of the sum is 0.

If the array passed in when calling the array_sum() function contains elements of non-numeric type, the element will be ignored. That is, strings, booleans, or other non-numeric elements in the array will not affect the calculation result.

The following is an example showing the results of the array_sum() function when the array contains elements of non-numeric type.

<?php
// 示例数组
$numbers = [1, 2, "3", 4, true];

// 计算数组所有元素的和
$sum = array_sum($numbers);

// 输出结果
echo "数组的和为：$sum";
?>

In this example, the array $numbers contains a string "3" and a Boolean value true. However, these two elements do not participate in the sum calculation. So the result returned by the function is 7, and the result is not affected by these non-numeric elements.

To sum up, the array_sum() function is a very practical function, which facilitates developers to perform sum calculations when processing arrays. It works on numeric arrays and can handle integers and floating point numbers. When using it, you need to pay attention to whether the array contains non-numeric elements to avoid calculation errors.

I hope this article can help you better understand and use the array_sum() function and improve your PHP programming skills.

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