XVI. Character type functions
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.
Passing anything else but a string or integer will
return FALSE immediately.
None besides functions from the standard C library which are
always available.
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.
This extension does not define any
configuration directives.
This extension does not define any resource types.
This extension does not define any constants.
- 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_lower -- Check for lowercase character(s)
- ctype_graph -- Check for any printable character(s) except space
- 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
