   #PHP Manual Character type functions Character type functions
   ctype_alpha

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                                  ctype_alnum

   (PHP 4 >= 4.0.4)
   ctype_alnum -- Check for alphanumeric character(s)

Description

   bool ctype_alnum ( string text)

   Returns TRUE if every character in text is either a letter or a digit,
   FALSE otherwise. In the standard C locale letters are just [A-Za-z]
   and the function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).

   See also ctype_alpha(), ctype_digit(), and setlocale().
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