XVI. Character type functions

Introducción

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.

Requerimientos

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

Instalación

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.

Configuración en tiempo de ejecución

Esta extensión no define ninguna directiva de configuración.

Tipos de recursos

Esta extensión no define ningún tipo de recurso.

Constantes predefinidas

Esta extensión no define ninguna constante.

Tabla de contenidos
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