Rotating array function

array_rotate.php

<?php
function rotateArray($a, $clockwise = true)
{
    $r = [];

    $i = 0;
    $ti = count($a[0]);
    $tj = count($a);
    for (; $i < $ti; $i++) {
        $row = [];
        for ($j = 0; $j < $tj; $j++) {
            if ($clockwise) {
                array_unshift($row, $a[$j][$i]);
            } else {
                $row[] = $a[$j][$i];
            }
        }
        if ($clockwise) {
            array_push($r, $row);
        } else {
            array_unshift($r, $row);
        }
    }

    return $r;
}

// tests:
$a = [
    [1,2,3],
    [4,5,6],
    [7,8,9]
];

print_r(rotate($a));
echo PHP_EOL;
print_r(rotate($a, false));