PhpSpreadsheet/tests/data/CellRangeBoundaries.php

<?php

return [
    [
        'B4:E9',
        [
            [
                2,
                4,
            ],
            [
                5,
                9,
            ],
        ],
    ],
    [
        'B4',
        [
            [
                2,
                4,
            ],
            [
                2,
                4,
            ],
        ],
    ],
];