Detailed explanation of several common array sum functions in PHP

In PHP, array is a very common data type. For numeric elements in arrays, the summation operation is also a function we often need to use. In the actual development process, we can use PHP's built-in array sum function to quickly implement this operation. This article will introduce several common array sum functions in PHP and how to use them.

1. array_sum function

The array_sum function is one of the most common summation functions in PHP. It calculates the sum of all numeric elements in an array and returns a result of type integer or floating point number.

Function syntax:

array_sum(array $array): number

Parameter description:

• $array: required. The input array.

Sample code:

$arr = [1, 2, 3, 4];
$sum = array_sum($arr);
echo $sum; // 输出：10

2. array_reduce function

The array_reduce function can iterate over all elements in the array and use the specified callback function to calculate A value in the array. During the execution of each callback function, the two input values ​​​​are calculated and the calculation results are passed to the next iteration.

Function syntax:

array_reduce(array $array, callable $callback, ?number $initial = null): mixed

Parameter description:

• $array: required. The input array.
• $callback: required. The callback function applied to each element. It accepts two values ​​as parameters, the first parameter is the accumulator of the calculated result, and the second parameter is the array element of the current iteration. The callback function must return an accumulator of the calculated result.
• $initial: optional. On the first iteration, used as the initial value of the accumulator. If this parameter is not specified, the first element of the array is used as the initial value.

Sample code:

$arr = [1, 2, 3, 4];
$sum = array_reduce($arr, function($accumulator, $currentValue) {
    return $accumulator + $currentValue;
}, 0);
echo $sum; // 输出：10

3. foreach loop

Using the foreach loop can also easily perform sum operations on arrays. We can iterate over all elements in the array and use an accumulator variable to record the summation result. In each loop, the value of the current element is added to the accumulator, and the result is saved back to the accumulator.

Sample code:

$arr = [1, 2, 3, 4];
$sum = 0;
foreach($arr as $num) {
    $sum += $num;
}
echo $sum; // 输出：10

Conclusion

The above are several common array summation functions and their usage in PHP. In the actual development process, we can choose the appropriate method according to different needs. Whether we are dealing with small or large numerical data, these functions can provide us with convenient, efficient, and accurate summing operations.

The above is the detailed content of Detailed explanation of several common array sum functions in PHP. For more information, please follow other related articles on the PHP Chinese website!