Checks if all of the characters in the provided string, text, are alphabetic. 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.

Returns TRUE if every character in text is a letter from the current locale, FALSE otherwise.

• Main PHP Function Online page
• ctype_upper() - Check for uppercase character(s)
• ctype_lower() - Check for lowercase character(s)
• setlocale() - Set locale information