Diagonal Difference

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    $first = $second=0;
    $j = $n-1;
    for($i=0;$i<$n; $i++){
        $first +=$a[$i][$i];
        $second +=$a[$i][$j];
        $j--;
    } 
    
    
    $result=  abs($first-$second);
    print abs($result);