
I.		Na początek
II.		Instalacja i konfiguracja
III.		Opis języka
IV.		Bezpieczeństwo
V.		Możliwości
VI.		Opis funkcji
VII.		Zend API
VIII.		PHP API: Interfejs rozszerzeń
X.		Dodatki

Manual PHP

Zapraszam do korzystania z zamieszczonego przeze mnie manuala php. Mam nadzieję, że ta jego kopia przyda się zarówno profesjonalnym programistą, jak i początkującym twórcą skryptów PHP.

Autorzy

Mehdi Achour,

Friedhelm Betz,

Antony Dovgal,

Nuno Lopes,

Philip Olson,

Georg Richter,

Damien Seguy,

Jakub Vrana,

I kilka innych

Redakcja:

Gabor Hojtsy,

Marcin Dąbrowski, Michał Grzechowiak, Leszek Krupiński, Adam Major, Paweł Paprota, Michał Pena, Sławomir Pucia, Jarek Tabor, Tomasz Wójtowicz,

Podręcznik PHP
Poprzedni		Następny

Rozdział 55. Returning Values

Returning values from your functions to PHP was described briefly in an earlier section; this section gives the details. Return values are passed via the return_value variable, which is passed to your functions as argument. The return_value argument consists of a zval container (see the earlier discussion of the call interface) that you can freely modify. The container itself is already allocated, so you don't have to run MAKE_STD_ZVAL on it. Instead, you can access its members directly.

To make returning values from functions easier and to prevent hassles with accessing the internal structures of the zval container, a set of predefined macros is available (as usual). These macros automatically set the correspondent type and value, as described in Tabela 55-1 and Tabela 55-2.

Notatka: The macros in Tabela 55-1 automatically return from your function, those in Tabela 55-2 only set the return value; they don't return from your function.

Tabela 55-1. Predefined Macros for Returning Values from a Function

Macro	Description
`RETURN_RESOURCE(resource)`	Returns a resource.
`RETURN_BOOL(bool)`	Returns a Boolean.
`RETURN_NULL()`	Returns nothing (a NULL value).
`RETURN_LONG(long)`	Returns a long.
`RETURN_DOUBLE(double)`	Returns a double.
`RETURN_STRING(string, duplicate)`	Returns a string. The `duplicate` flag indicates whether the string should be duplicated using estrdup().
`RETURN_STRINGL(string, length, duplicate)`	Returns a string of the specified length; otherwise, behaves like `RETURN_STRING`. This macro is faster and binary-safe, however.
`RETURN_EMPTY_STRING()`	Returns an empty string.
`RETURN_FALSE`	Returns Boolean false.
`RETURN_TRUE`	Returns Boolean true.

Tabela 55-2. Predefined Macros for Setting the Return Value of a Function

Macro	Description
`RETVAL_RESOURCE(resource)`	Sets the return value to the specified resource.
`RETVAL_BOOL(bool)`	Sets the return value to the specified Boolean value.
`RETVAL_NULL`	Sets the return value to NULL.
`RETVAL_LONG(long)`	Sets the return value to the specified long.
`RETVAL_DOUBLE(double)`	Sets the return value to the specified double.
`RETVAL_STRING(string, duplicate)`	Sets the return value to the specified string and duplicates it to Zend internal memory if desired (see also `RETURN_STRING`).
`RETVAL_STRINGL(string, length, duplicate)`	Sets the return value to the specified string and forces the length to become `length` (see also `RETVAL_STRING`). This macro is faster and binary-safe, and should be used whenever the string length is known.
`RETVAL_EMPTY_STRING`	Sets the return value to an empty string.
`RETVAL_FALSE`	Sets the return value to Boolean false.
`RETVAL_TRUE`	Sets the return value to Boolean true.

Complex types such as arrays and objects can be returned by using array_init() and object_init(), as well as the corresponding hash functions on return_value. Since these types cannot be constructed of trivial information, there are no predefined macros for them.

Poprzedni	Spis treści	Następny
Duplicating Variable Contents: The Copy Constructor	Początek rozdziału	Printing Information

print 'Kształtki 1171501896' . "\n"; print 'wyważarki 1171501850' . "\n"; print 'doradztwo podatkowe poznań 1171501861' . "\n"; print 'Przeprowadzki Ruda Śląska 1171501833' . "\n"; print 'Przeprowadzki 1171501943' . "\n";