include_once

 include_once ( string $file ) 

説明

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.

戻り値

The return value of the included file, if any.