ctype_lower

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Supported Versions: PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8
Check for lowercase character(s)
ctype_lower(mixed $text): bool
            return static::$snakeCache[$key][$delimiter];

        }



        if (! ctype_lower($value)) {

            $value = preg_replace('/\s+/u', '', ucwords($value));



            $value = static::lower(preg_replace('/(.)(?=[A-Z])/u', '$1'.$delimiter, $value));
src/Illuminate/Support/Str.php