How to find the average of an array in php

In PHP programming, finding the average in an array is a very basic operation. The following are some methods to achieve the average:

Method 1: Use a for loop

function avg($arr){
    $sum = 0;
    $count = count($arr);
    for ($i = 0; $i < $count; $i++){
        $sum += $arr[$i];
    }
    return $sum / $count;
}

Method 2: Use array_sum() and count() functions

function avg($arr){
    return array_sum($arr) / count($arr);
}

Method 3: Using foreach loop

function avg($arr){
    $sum = 0;
    foreach ($arr as $value){
        $sum += $value;
    }
    return $sum / count($arr);
}

Using the above three methods, we can easily implement the average calculation of an array. Suppose we have the following array:

$arr = array(1, 2, 3, 4, 5);

We can call the avg() function and use any of the above three methods to calculate the average of the array:

echo avg($arr);   // 3

Note: The above The code is applicable to all versions of PHP, and the implementation of method 2 may be more concise. At the same time, we can also use the array_reduce() function and functions in other function libraries to implement the averaging function.

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