Check all surrounding fields in a 2d array, ignoring out of bounds elements

checkPosition.php

private function checkPosition(int $x, int $y, array $grid): bool
    {
        $neighbors = [];

        $offsets = [
            [-1, -1],
            [-1, 0],
            [-1, 1],
            [0, -1],
            [0, 1],
            [1, -1],
            [1, 0],
            [1, 1],
        ];

        $maxX = count($grid) - 1;
        $maxY = count($grid[0]) - 1;

        foreach ($offsets as [$dx, $dy]) {
            $nx = $x + $dx;
            $ny = $y + $dy;

            if ($nx < 0 || $ny < 0 || $nx > $maxX || $ny > $maxY) {
                continue;
            }
            $value = $grid[$nx][$ny];
            $neighbors[] = [
                $nx,
                $ny,
            ];
        }

        return $neighbors
    }