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<?php
class MyPlugin extends Plugin {

	...

	public function getEvents() {
		return array(
			array(
				'event' => "preaction",
				'callback' => array("this", "run")
			)
			// Add multiple events here
		);
	}

	public function run() {
		// This will execute withwhen the "preaction" event is triggered
	}
}
?>