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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