   #PHP Manual Character type functions ctype_upper Database (dbm-style)
   abstraction layer functions

   PHP Manual
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                                 ctype_xdigit

   (PHP 4 >= 4.0.4)
   ctype_xdigit --  Check for character(s) representing a hexadecimal
   digit

Description

   bool ctype_xdigit ( string text)

   Returns TRUE if every character in text is a hexadecimal 'digit', that
   is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.

   See also ctype_digit().
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