Глава 16. Control Structures

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include_once()

The include_once() statement includes and evaluates

the specified file during the execution of the script.

This is a behavior similar to the include() statement,

with the only difference being that if the code from a file has already

been included, it will not be included again. As the name suggests,

it will be included just once.

include_once() should be used in cases where

the same file might be included and evaluated more than once during a

particular execution of a script, and you want to be sure that it is

included exactly once to avoid problems with function redefinitions,

variable value reassignments, etc.

For more examples on using require_once() and

include_once(), look at the

PEAR code included in the latest

PHP source code distributions.

Return values are the same as with include(). If the file

was already included, this function returns TRUE

Замечание:

include_once() was added in PHP 4.0.1pl2

Замечание:

Be aware, that the behaviour of include_once()

and require_once() may not be what you expect

on a non case sensitive operating system (such as Windows).

This behaviour changed in PHP 5 - the path is normalized first so that

C:\PROGRA~1\A.php is realized the same as

C:\Program Files\a.php and the file is included just once.

See also include(),

require(), require_once(),

get_required_files(),

get_included_files(), readfile(),

and virtual().

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require_once()

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Функции

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.