Question

How to sum the corners of a matrix in PHP

Answer 1

function sumMatrixCorners($matrix) {
    return $matrix[0][0] + 
           $matrix[0][count($matrix[0]) - 1] + 
           $matrix[count($matrix) - 1][0] + 
           $matrix[count($matrix) - 1][count($matrix[0]) - 1];
}

$matrix = array(
    array(1, 2, 3, 4),
    array(5, 6, 7, 8),
    array(9, 3, 2, 0)
);

echo sumMatrixCorners($matrix);



/*
run:

14

*/

 

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