How to sum the values ​​of php arrays (three methods)

In PHP development, array is a very common data type and one of the powerful tools for processing data. Arrays can hold multiple values, and each value can be accessed through an index. In actual development, we often need to sum the values ​​of arrays.

PHP provides a wealth of array functions, including functions for summing arrays. These functions include: array_sum(), array_reduce(), foreach loop, etc.

Next, let’s look at how these functions are implemented.

Use array_sum() function to sum

The array_sum() function can sum the values ​​in the array. This function can only be used to find the sum of array elements of pure numeric type. The following is the syntax of the function:

array_sum(array $array): float|int

Among them, $array is the array to be summed, and the return value of the function is the numerical type float or int.

The sample code is as follows:

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

The execution result is:

15

In the above sample code, we define an array $array and pass it as a parameter to array_sum () function performs summation operations. Finally, the obtained result $sum is output.

Use the array_reduce() function for summation

The array_reduce() function can iterate over the values ​​in the array and add each element to the callback function in turn for operation. The following is the syntax of this function:

array_reduce(array $array, callable $callback, $initial = null)

Among them, $array is the array to be summarized; $callback is a callback function used to specify the method of summarization; $initial is optional initial value. The return value of the function is the summary result.

The sample code is as follows:

$array = array(1, 2, 3, 4, 5);
$sum = array_reduce($array, function($a, $b) {
    return $a + $b;
}, 0);
echo $sum;

The execution result is:

15

In the above sample code, we use the array_reduce() function to perform the sum operation on the array $array, and at the same time An anonymous function is used as a callback function to implement the accumulation operation of array elements.

Use foreach loop to sum

Use foreach loop to traverse the array, and you can also implement the summation operation on the array elements. It should be noted that a variable needs to be used to save the result, each element is added to the variable in turn, and the result is output.

The sample code is as follows:

$array = array(1, 2, 3, 4, 5);
$sum = 0;
foreach($array as $val) {
    $sum += $val;
}
echo $sum;

The execution result is:

15

In the above sample code, we use a foreach loop to traverse the array $array and add each element Perform an accumulation operation. Finally, the obtained results are output.

To sum up, PHP provides a variety of ways to implement the sum operation of array elements. Developers can choose different methods to operate according to actual needs.

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