PhpSpreadsheet/tests/data/CellCoordinates.php

<?php

return [
    [
        'A1',
        [
            'A',
            1,
        ],
    ],
    [
        'A12',
        [
            'A',
            12,
        ],
    ],
    [
        'J1',
        [
            'J',
            1,
        ],
    ],
    [
        'J20',
        [
            'J',
            20,
        ],
    ],
    [
        'AI1',
        [
            'AI',
            1,
        ],
    ],
    [
        'AI2012',
        [
            'AI',
            2012,
        ],
    ],
];