   #PHP Manual Function Reference cyrus_unbind ctype_alnum

   PHP Manual
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XV. Character type functions

Introduction

   The functions provided by this extension check whether a character or
   string falls into a certain character class according to the current
   locale (see also setlocale()).

   When called with an integer argument these functions behave exactly
   like their C counterparts from ctype.h.

   When called with a string argument they will check every character in
   the string and will only return TRUE if every character in the string
   matches the requested criteria. When called with an empty string the
   result will always be TRUE.

   Passing anything else but a string or integer will return FALSE
   immediately.

Requirements

   None besides functions from the standard C library which are always
   available.

Installation

   Beginning with PHP 4.2.0 these functions are enabled by default. For
   older versions you have to configure and compile PHP with
   --enable-ctype. You can disable ctype support with --disable-ctype.

   The windows version of PHP has built in support for this extension.
   You do not need to load any additional extension in order to use these
   functions.

     Note: Builtin support for ctype is available with PHP 4.3.0.

Runtime Configuration

   This extension has no configuration directives defined in php.ini.

Resource Types

   This extension has no resource types defined.

Predefined Constants

   This extension has no constants defined.

   Table of Contents
   ctype_alnum -- Check for alphanumeric character(s)
   ctype_alpha -- Check for alphabetic character(s)
   ctype_cntrl -- Check for control character(s)
   ctype_digit -- Check for numeric character(s)
   ctype_graph -- Check for any printable character(s) except space
   ctype_lower -- Check for lowercase character(s)
   ctype_print -- Check for printable character(s)
   ctype_punct --  Check for any printable character which is not
          whitespace or an alphanumeric character

   ctype_space -- Check for whitespace character(s)
   ctype_upper -- Check for uppercase character(s)
   ctype_xdigit --  Check for character(s) representing a hexadecimal
          digit
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