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# XVI. Character type functions

# Einführung

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.

# Anforderungen

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`.

# Laufzeit Konfiguration

Diese Erweiterung definiert keine Konfigurationseinstellungen in der `php.ini`.

# Resource Typen

Diese Erweiterung definiert keine Resource-Typen.

# Vordefinierte Konstanten

Diese Erweiterung definiert keine Konstanten.

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