XV. Character Type Functions

Bevezetés

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.

It should be noted that ctype functions are always prefered over regular expressions, and even to some equivalent str_* and is_* functions. This is because of the fact that ctype uses a native C library and thus processes significantly faster.

Követelmények

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

Telepítés

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.

A PHP Windowsos változata beépített támogatással rendelkezik eme kiterjesztéshez. nincs szükség semmilyen kiterjesztés betöltésére, hogy az itt felsorolt függvnyeket használhasd.

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

Futásidejű beállítások

Ez a kiterjesztés semmilyen konfigurációs beállításokat nem definiál a php.ini állományban.

Erőforrás típusok

Ez a kiterjesztés semmilyen erőforrás típust nem definiál.

Előre definiált állandók

Ez a kiterjesztés semmilyen konstans értéket nem definiál.

Tartalom
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