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@ 2020-11-08T13:46:47Z

<?php

function getNewLetter(string $letter, int $number): string
{
    $newOrd = (ord($letter) + $number - 65) % 26;
    if ($newOrd < 0) {
        $newOrd += 26;
    }

    return chr(65 + $newOrd);
}

echo getNewLetter("H", 4);
echo getNewLetter("H", 26);
echo getNewLetter("H", -32);

Output
Performance
VLD
References
Branches

chr: documentation ( source)
ord: documentation ( source)

preferences:dark modelive previewkey bindings

119.85 ms | 405 KiB | 5 Q