PHP is a widely used open source server-side scripting language that is widely used for web development. In web development, arrays are a very common data structure. For the elements in the array, we may need to perform some statistics on them, such as averaging. PHP provides many array manipulation functions, including functions for finding the average of an array. This article will introduce how to use PHP to write a function that finds the average of an array.

What is the array mean?

The average is the sum of all numbers divided by the number of numbers, while the array average is the sum of the array elements divided by the length of the array. We can use PHP's array manipulation functions to calculate the array average.

PHP function implementation

The following is a PHP function that can calculate the average of an array:

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

This function accepts an array as a parameter, using count()Function to get the length of the array. Then, iterate through each element in the array and add their values, and finally get the average of the array by dividing the sum by the length of the array. Finally, the calculated average is returned.

Function usage example

The following is a sample array and an example of how to use the array_avg() function to calculate the average:

$my_array?=?array(1,?2,?3,?4,?5);
$average?=?array_avg($my_array);
echo?"The?average?for?the?array?is:?$average";

This example creates An array of 5 elements and pass it to the array_avg() function. The function calculates the average as 3 and stores it in the variable $average. Finally, the average is printed to the screen.

Summary

This article introduces how to use PHP to write a function that finds the average of an array. You can easily average the elements in an array by using the count() function and a foreach loop. Using these functions, you can easily reuse your code and improve its readability and maintainability.

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