SoftUni Chalange | RotateMatrix | Procedural

<?php

/**
* Procedural
*/

$n = 3;
$matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
];

function rotate(&$matrix, $n)
{
    $result = [];

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

    $matrix = $result;
}

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

// Show initial matrix
renderMatrix($matrix, $n);
echo '<br />';

// One rotation
rotate($matrix, $n);
renderMatrix($matrix, $n);