## Example

`

     include_once ( string $file )

`

## Description

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.

## Return Values

The return value of the included file, if any.