How to remove the maximum and minimum values ​​from a php array and then calculate the average

Method: 1. Sort the array in ascending order, and use "array_pop(array)" and "array_shift(array)" to remove the maximum and minimum values; 2. Use "count(array)" and "array_sum( Array)" to obtain the array length and element sum; 3. Use "element sum/array length" to calculate the average.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Remove the largest php array Method of averaging after values ​​and minimum values

1. Remove the maximum and minimum values ​​from the array

• Use sort () Sort the array in ascending order

• After sorting, the first element of the array is the minimum value, and the last element is the maximum value. Just use the array_pop() and array_shift() functions Just delete these two values.

  • array_pop(): Delete the last element in the array.

  • array_shift(): Delete the first element in the array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,45,9,52,0,-5,21,-1,40);
sort($arr);
var_dump($arr);
array_pop($arr);        //去掉最大值
array_shift($arr);       //去掉最小值
var_dump($arr);
?>

2. Statistics of the array length and the sum of array elements after removing the maximum and minimum values

Because the array_pop() and array_shift() functions will modify the original array, you can directly use the count() function to obtain the processed original array length.

$len=count($arr);
echo "处理后的数组长度为：".$len;

Use array_sum() directly to get the sum of array elements:

$sum=array_sum($arr);
echo "<br>处理后的数组元素之和为：".$sum;

3. Find the average: Use the "sum of array elements" divided by the "array length"

$num=$sum/$len;
echo "<br>平均数为：".$num;

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