How to find the average value of a two-dimensional array in PHP

Implementation steps: 1. Define a variable and assign a value of 0 to store the sum of elements of the two-dimensional array. The syntax is "$s=0;"; 2. Traverse the two-dimensional array and calculate the elements of the two-dimensional array. And, the syntax "foreach(array as $v){if(is_array($v)){$s =array_sum($v);}else{$s =$v;}}"; 3. Use count() to calculate The length of the two-dimensional array, the syntax is "count(array,1)"; 4. Use the "elements and/length" statement to calculate the average.

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

In php, you can mainly use the foreach statement, The array_sum() function and count() function are used to find the average of a two-dimensional array.

Implementation steps:

Step 1: Define a variable and assign a value of 0, used to store the elements and values ​​of the two-dimensional array

$sum=0;

Step 2: Traverse the two-dimensional array, calculate the elements and

• Use the foreach statement to loop through the outer array elements of the two-dimensional array

• In the loop body, use the is_array() function to determine whether the outer element is an array type, and use the "=" operator to sum

  • If it is not an array type, add and sum the outer elements that are not

  • If it is an array type, use the array_sum() function to calculate the sum of all elements in the inner array , and added together with the sum of outer elements.

foreach($arr as $v){
	if(is_array($v)){
		$sum+=array_sum($v);
	}else{
		$sum+=$v;
	}
}

The loop ends, and the value of the variable $sum is the sum of the elements of the two-dimensional array.

echo "二维数组的和为：".$sum;

Step 3: Use the count() function to calculate the length of the two-dimensional array

$len=count($arr,1);

Recommended reading: "PHP Array Learning: Calculating the Array Length of a Two-Dimensional Array" to understand the mechanism of the count() function to calculate the length of a two-dimensional array.

Step 4: Use the "/" operator to divide the sum of elements by the length of the array to calculate the average

二维数组的元素和 / 二维数组的长度

Full sample code:

<?php  
header("content-type:text/html;charset=utf-8");
$arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); 
var_dump($arr);
$sum=0;
foreach($arr as $v){
	if(is_array($v)){
		$sum+=array_sum($v);
	}else{
		$sum+=$v;
	}
}
echo "二维数组的和为：".$sum."<br>";
$len=count($arr,1);
echo "二维数组的长度为：".$len."<br>";
$a=$sum/$len;
echo "二维数组的平均数为：".$a;
?>

Recommended learning: "PHP Video Tutorial"

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