SoftUni Chalange | RotateMatrix | OOP

<?php
/**
* Object-oriented
*/

class Matrix
{
    private $matrix = [];
    private $n = 0;

    public function __construct($n)
    {
        $this->n = $n;
        $index = 1;
        for ($row = 1; $row <= $n; $row++) {
            $currRow = [];
            for ($col = 1; $col <= $n; $col++) {
                $currRow[] = $index;
                $index++;
            }
            $this->matrix[] = $currRow;
        }
    }

    public function rotate()
    {
        $result = [];

        for ($col = 0; $col < $this->n; $col++) {
            $currRow = [];
            for ($row = $this->n - 1; $row >= 0; $row--) {
                $currRow[] = $this->matrix[$row][$col];
            }
            $result[] = $currRow;
        }

        $this->matrix = $result;
    }

    public function render()
    {
        for ($row = 0; $row < $this->n; $row++) {
            for ($col = 0; $col < $this->n; $col++) {
                echo $this->matrix[$row][$col] . ' ';
            }
            echo '<br />';
        }
    }

}

// Initial matrix
$matrix = new Matrix(3);
$matrix->render();
echo '<br/>';

// One rotation
$matrix->rotate();
$matrix->render();
echo '<br/>';