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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)) if $text is just a single character, but other languages have letters that are considered neither upper nor lower case.
See also ctype_upper(), ctype_lower(), and setlocale().
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ctype_alnum | Upp | ctype_cntrl |