PHP array value sum

Arrays are a common data structure when developing PHP applications. When dealing with some data, you usually need to summarize or count it, and sometimes you need to sum the values ​​in an array. In this article, we will show you how to sum the values ​​in an array using PHP.

1. Use the array_sum() function

First of all, PHP provides a built-in function array_sum(), which can quickly sum the values ​​in the array. This function receives an array as argument and returns the sum of all elements in the array.

The following is a sample code for summing using the array_sum() function:

$numbers = array(1, 2, 3, 4, 5);
$sum = array_sum($numbers);

echo "数组中元素的和为: " . $sum;

This code will output the following results:

数组中元素的和为: 15

2. Manual summation

If we need more readable code or have special processing requirements for the values ​​in the array, we can manually write the code for summation.

The following is a sample code for manual summation:

$numbers = array(1, 2, 3, 4, 5);
$sum = 0;

foreach ($numbers as $number) {
    $sum += $number;
}

echo "数组中元素的和为: " . $sum;

The execution result of this code is the same as using the array_sum() function.

3. Consider the type of elements in the array

It should be noted that in the above example, the elements in the array are all integers. If the array contains elements of other types, such as strings or objects, they will need to be converted appropriately before they can be summed.

The following is a sample code using the array_sum() function:

$items = array("1.2", "2.4", 3, new stdClass());
$sum = array_sum($items);

echo "数组中元素的和为: " . $sum;

The execution result of this code is:

Notice: A non well formed numeric value encountered
数组中元素的和为: 5

It can be found that because the array contains a non-number Type of element caused PHP to generate a warning (Notice), and the return value was not as expected.

In order to solve this problem, we need to use the type conversion function to convert the element to a numeric type.

The following is a sample code for manual summation:

$items = array("1.2", "2.4", 3, new stdClass());
$sum = 0;

foreach ($items as $item) {
    if (is_numeric($item)) {
        $sum += (float)$item;
    }
}

echo "数组中元素的和为: " . $sum;

This code converts string type elements to floating point number types, avoiding type conversion problems.

Summary:

Summing the values ​​in an array is a common task when developing PHP applications. There is a built-in function array_sum() in PHP that can perform summation quickly, or you can also manually write code to perform summation. When processing arrays, you need to pay attention to the type of elements in the array and perform appropriate filtering and verification of user-entered data.

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