ctype_alpha
Description
bool ctype_alpha ( string text)Returns TRUE if every character in text is a letter from the current locale, FALSE otherwise. In the standard C locale letters are just [A-Za-z] and ctype_alpha() is equivalent to (ctype_upper($text) || ctype_lower($text)), but other languages have letters that are considered neither upper nor lower case.
See also ctype_upper(), ctype_lower(), and setlocale().