application of power of matrix library

//baca matrix dari file .csv
if (($handle = fopen('the_matrix.csv', 'r')) !== FALSE) {
    $m1=array();
    $row=0;
    while (($data = fgetcsv($handle)) !== FALSE) {
        for($col=0;$col<count($data);$col++){
            $m1[$row][$col]=$data[$col];
        }
        $row++;
    }
    fclose($handle);
} else {
    echo 'Failed to read the file!';
    exit();
}
echo 'Original Matrix:';
print_matrix($m1);
$start_time = microtime(true);
$pangkat=mat_pow($m1, 512);
$stop_time = microtime(true);

echo 'Matrix after power to 512:';
print_matrix($pangkat);

echo 'Time needed to calculate (ms) = '.($stop_time-$start_time);