system/engine/loader.php

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<?php
/**
 * @package        OpenCart
 * @author        Daniel Kerr
 * @copyright    Copyright (c) 2005 - 2017, OpenCart, Ltd. (https://www.opencart.com/)
 * @license        https://opensource.org/licenses/GPL-3.0
 * @link        https://www.opencart.com
 */

/**
 * Loader class
 */
final class Loader {
	protected $registry;

	/**
	 * Constructor
	 *
	 * @param    object $registry
	 */
	public function __construct($registry) {
		$this->registry = $registry;
	}

	/**
	 *
	 *
	 * @param    string $route
	 * @param    array $data
	 *
	 * @return    mixed
	 */
	public function controller($route) {
		$args = func_get_args();

		array_shift($args);

		// Sanitize the call
		$route = preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route);

		// Keep the original trigger
		$trigger = $route;

		// Trigger the pre events
		$result = $this->registry->get('event')->trigger('controller/' . $trigger . '/before', array(&$route, &$args));

		// Make sure its only the last event that returns an output if required.
		if ($result != null && !$result instanceof Exception) {
			$output = $result;
		} else {
			$action = new Action($route);
			$output = $action->execute($this->registry, $args);
		}

		// Trigger the post events
		$result = $this->registry->get('event')->trigger('controller/' . $trigger . '/after', array(&$route, &$args, &$output));

		if ($result && !$result instanceof Exception) {
			$output = $result;
		}