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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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