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@ 2019-05-27T22:55:52Z

<?php
$lookup = ['neither', 'upper', 'lower'];
$tests = ['A', 'z', '+', '0', 'ǻ', 'Ͱ', null];

foreach ($tests as $test) {
    if (preg_match('~(\p{Lu})|(\p{Ll})~u', $test, $out)) {
        end($out); // advance pointer to final element
        $index = key($out);
    } else {
        $index = 0;
    }
    echo "{$test}: {$lookup[$index]}\n";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
end: documentation ( source)
key: documentation ( source)

preferences:dark modelive previewkey bindings

27.48 ms | 406 KiB | 5 Q