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include_once difference between PHP 4 and PHP 5

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http://lpilinux.com – 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() may be used in cases where the same file might be included and evaluated more than once during a particular exec (HowTos)