Question

How to display the lower triangular matrix in PHP

Answer 1

function printLowerTriangular($matrix) {
    $rows = count($matrix);  
    $cols = count($matrix[0]);  
    
    for ($i = 0; $i < $rows; $i++) {
        for ($j = 0; $j < $cols; $j++) {
            if ($i < $j) {
                echo "0" . " ";
            }
            else {
                echo $matrix[$i][$j] . " ";
            }
        }
        echo "\n";
    }
}
 
$matrix = array(array(1, 2, 3),
                array(4, 5, 6),
                array(7, 8, 9));
 
printLowerTriangular($matrix);




/*
run:

1 0 0 
4 5 0 
7 8 9 

*/

 

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