[vBNinja]

put the php on a file (name.php)

then in your plugin use:

PHP Code:

require(DIR . '/path/to/file/name.php'); 


Example:
If you saved the file in the "includes" folder, you would use

PHP Code:

require(DIR . '/includes/name.php'); 


you can use require or require_once, it depends on the situation
change the path to file according to where you saved the file in relation to your forum root