Question

How to add 2 matrices in PHP

Answer 1

$a = array(array(1, 0, 2),  
           array(3, 5, 6),  
           array(7, 4, 1));  
   
$b = array(array(1, 0, 1),  
           array(2, 2, 1),  
           array(1, 3, 1));  
   
$rows = count($a);  
$cols = count($a[0]);  
   
$sum = array_fill(0, $cols, array_fill(0, $rows, 0));  
   
for ($i = 0; $i < $rows; $i++) {  
    for ($j = 0; $j < $cols; $j++) {  
        $sum[$i][$j] = $a[$i][$j] + $b[$i][$j];  
    }  
}  
   
for ($i = 0; $i < $rows; $i++) {  
    for ($j = 0; $j < $cols; $j++) {  
       echo $sum[$i][$j] . " ";  
    }  
    echo "\n";
}    




/*
run:

2 0 3 
5 7 7 
8 7 2 

*/

 

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