Question

How to sum 2D array (matrix) in PHP

Answer 1

function sum_array($arr)
{
    $rows = count($arr);
    $cols = count($arr[0]);
    $sum = 0;
     
    for ($i = 0; $i < $rows; $i++) {
        for ($j = 0; $j < $cols; $j++)
            $sum += $arr[$i][$j];
   }
   
   return $sum;
}
 
$arr = array(
    array(11, 32, 13),
    array(20, 80, 990),
);
 
echo sum_array($arr);
 
 
/*
run:
 
1146  
    
*/

 

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