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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

Смотрите также require(), include(), include_once(), get_required_files(), get_included_files(), readfile(), and virtual().