php sum array values

When developing using PHP, we often encounter the need to sum the values ​​in an array. At this time, we can use some functions provided by PHP to achieve this.

PHP provides two functions to calculate the sum of the values ​​in an array: array_sum() and array_reduce().

The array_sum() function is used to calculate the sum of all numbers in the array, while the array_reduce() function is used to iterate over the values ​​in the array, accumulate them according to the callback function, and finally return an accumulated result. .

For simple calculations, the array_sum() function is the most convenient. For example, the following example adds all the values ​​in an array containing numbers:

$numbers = array(1, 2, 3, 4, 5);
$total = array_sum($numbers);
echo 'The total is: ' . $total;

Output:

The total is: 15

In the above code, $numbers is an array containing the numbers 1 to 5. Then, use the array_sum() function to calculate the sum of all numbers in the array, capture the result in the variable $total, and finally output the result.

If the array contains non-numeric values, they are ignored. For example, in the following example, although the array contains the string 'hello' which is not a number, it will be ignored and will not affect the calculation result:

$numbers = array(1, 'hello', 2, 3, 4, 5);
$total = array_sum($numbers);
echo 'The total is: ' . $total;

Output:

The total is: 15

If To calculate the sum of all numbers in a multidimensional array, you can use the array_walk_recursive() function. For example, the following example adds all the numbers in a multidimensional array:

$data = array(
    array(1, 2, 3),
    array(4, 5, 6),
    array(
        array(7, 8),
        array(9, 10)
    )
);

$total = 0;
array_walk_recursive($data, function ($value) use (&$total) {
    $total += $value;
});

echo 'The total is: ' . $total;

Output:

The total is: 55

In the above code, $data is an array containing multidimensional arrays. Then, using the array_walk_recursive() function, each number in the array is passed into an anonymous function, where it is accumulated. Finally, the result is stored in the variable $total and the result is output.

In addition to using the array_sum() function and array_reduce() function, we can also use a loop to calculate the sum of all numbers in the array. The following is an example of using a foreach loop:

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

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

echo 'The total is: ' . $total;

Output:

The total is: 15

In the above code, the loop traverses all the values ​​​​in the array $numbers and adds each value to In the variable $total, the final result is output.

In general, calculating the sum of all numbers in an array is a very basic requirement. PHP provides a variety of ways to complete this task. Developers can choose the method that suits them according to the actual situation.

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