PhpSpreadsheet/tests/data/Calculation/TextData/CHAR.php

<?php

return [
    [
        'ABC',
        '#VALUE!',
    ],
    [
        -5,
        '#VALUE!',
    ],
    [
        65,
        'A',
    ],
    [
        123,
        '{',
    ],
    [
        126,
        '~',
    ],
];