[PHP] Fungsi Perkalian Matriks

perkalian_matriks.php

<?php 

/* Fungsi perkalian matriks
* @f2face - 2013
*/
function kalikan_matriks($matriks_a, $matriks_b) {
	$hasil = array();
	for ($i = 0; $i < sizeof($matriks_a); $i++) {
		for ($j = 0; $j < sizeof($matriks_b[0]); $j++) {
			$temp = 0;
			for ($k = 0; $k < sizeof($matriks_b); $k++) {
				$temp += $matriks_a[$i][$k] * $matriks_b[$k][$j];
			}
			$hasil[$i][$j] = $temp;
		}
	}
	return $hasil;
}

// matriks A
$a = [];

$a[] = [1, 2, 3];
$a[] = [4, 5, 6];
$a[] = [7, 8, 9];
$a[] = [10, 11, 12];

// Matriks B
$b = [];

$b[] = [1, 2, 3, 4];
$b[] = [5, 6, 7, 8];
$b[] = [9, 10, 11, 12];

// Kalikan
$hasil = kalikan_matriks($a, $b);
?>
<table cellspacing="0" cellpadding="10" border="1">
    <tr>
        <td>
            <?php 
            echo '<h3>Matriks A:</h3>';

            echo '<pre>';
            print_r($a);
            echo '</pre>';
            ?>
        </td>
        <td valign="top">
            <?php 
            echo '<h3>Matriks B:</h3>';

            echo '<pre>';
            print_r($b);
            echo '</pre>';
            ?>
        </td>
        <td>
            <h3>Hasil Perkalian Matriks A x B</h3>
            <table border='1' cellspacing='0' cellpadding='50'>
            <?php 
            for ($i = 0; $i < sizeof($hasil); $i++) {
                echo "<tr>";
                for ($j = 0; $j < sizeof($hasil[$i]); $j++) {
                    echo "<td>" . round($hasil[$i][$j], 4)  . "</td>";
                }
                echo "</tr>";
            }
            ?>
            </table>
        </td>
    </tr>
</table>