How to calculate the average value of array elements in php

In PHP, different methods can be used to calculate the average of array elements. The following are several commonly used methods:

1. Use array_sum() and count() functions

This method is relatively simple. Directly call array_sum() to calculate the value of all elements of the array. and, then call count() to calculate the number of array elements. Finally, divide the sum by the number to get the average value. The sample code is as follows:

$arr = array(1, 2, 3, 4, 5);
$average = array_sum($arr) / count($arr);
echo $average; // 3

2. Use a loop

This method is more flexible. You can directly accumulate the sum of array elements in the loop and calculate the number of elements. Finally Divide the sum by the number of items to get the average. The sample code is as follows:

$arr = array(1, 2, 3, 4, 5);
$sum = 0;
$count = 0;
foreach ($arr as $value) {
  $sum += $value;
  $count++;
}
$average = $sum / $count;
echo $average; // 3

3. Use array_reduce() function

This method uses PHP's built-in array_reduce() function to add the array elements in sequence and finally return the sum. Then divide the sum by the number of array elements. The sample code is as follows:

$arr = array(1, 2, 3, 4, 5);
$average = array_reduce($arr, function($carry, $value) {
    return $carry + $value;
}) / count($arr);
echo $average; // 3

4. Use array_walk() function

This method uses PHP's built-in array_walk() function to operate on each element in the array. In each operation, the value of the current element is added to the accumulator, and at the end the average is obtained by dividing by the number of elements. The sample code is as follows:

$arr = array(1, 2, 3, 4, 5);
$sum = 0;
array_walk($arr, function($value) use (&$sum) {
    $sum += $value;
});
$average = $sum / count($arr);
echo $average; // 3

The above are 4 commonly used methods. You can choose the appropriate method to calculate the average according to the specific situation.

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