Do you use array_sum to sum two-dimensional arrays in PHP?

It is not possible to only use array_sum() to sum two-dimensional arrays in php, because the array_sum() function only processes one-dimensional arrays; if you want to use array_sum() to implement two-dimensional array sum, you also need to use foreach Statement, syntax "$sum=0;foreach($arr as $v){if(is_array($v)){$sum =array_sum($v);}else{$sum =$v;}}".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php two-dimensional array only uses array_sum () cannot be summed.

Reason: The array_sum() function only processes one-dimensional arrays and is invalid for multi-dimensional arrays.

<?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);
$sum=array_sum($arr);
echo "二维数组的和为：".$sum;
?>

The calculation result is obviously wrong. It only counts the sum of the outer elements.

So how to use the array_sum() function to calculate the sum of elements of a two-dimensional array?

Solution: array_sum() function foreach statement

Sum steps

Step 1 , use the foreach statement to loop through the outer array elements of the two-dimensional array

foreach($arr as $v){
//循环体代码
}

• Traverse the given $arr array, and change the current outer array in each loop The value of is assigned to $v.

Step 2. 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 it up

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

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

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

Implementation code:

function f($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>";
}

Call the above function

$arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); 
var_dump($arr);
f($arr);

$arr = array(array(2,4,6),array(8,10,12)); 
var_dump($arr);
f($arr);

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