PHP. Руководство по PHP. 2005
require_once
require_once()
The require_once() statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the require() statement, with the only difference being that if the code from a file has already been included, it will not be included again. See the documentation for require() for more information on how this statement works.
require_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 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: require_once() was added in PHP 4.0.1pl2
Замечание: Be aware, that the behaviour of require_once() and include_once() may not be what you expect on a non case sensitive operating system (such as Windows).
Пример 16-12. require_once() is case insensitive on Windows
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| Внимание |
| Версии PHP для Windows до PHP 4.3.0 не поддерживают возможность использования удаленных файлов этой функцией даже в том случае, если опция allow_url_fopen включена. |
See also require(), include(), include_once(), get_required_files(), get_included_files(), readfile(), and virtual().
Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.
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