PhpSpreadsheet/tests/data/Calculation/LookupRef/COLUMN.php

<?php

return [
    [
        1,
        null,
    ],
    [
        2,
        'B13',
    ],
    [
        [2, 3, 4],
        'B2:D2',
    ],
    [
        2,
        ['B' => 'B5', 'C' => 'C5', 'D' => 'D5'],
    ],
    [
        [2, 3, 4],
        'B2:D3',
    ],
    [
        [2, 3, 4],
        'Sheet1!B2:D2',
    ],
    [
        [2, 3, 4],
        '"WorkSheet #1"!B2:D2',
    ],
    [1, []],
];