<?php
		function process(){
			$action = $this->input->post('action');

			$pass_through = array(
				'update_main', 'update_alt', 'update_rank',
				'delete_main', 'delete_alt', 'delete_rank',
				'insert_main', 'insert_alt', 'insert_rank'
			);

			if(in_array($action, $pass_through)){
				$action = '_'.$action;
				$this->$action();
			} else{
				// Error.
			}
		}
?>