AppHelper.php

	public function assetUrl($path, $options = array()) {
		if (is_array($path)) {
			return $this->url($path, !empty($options['fullBase']));
		}

		if (strpos($path, '://') !== false) {
			return $path;
		}

		if (!array_key_exists('plugin', $options) || $options['plugin'] !== false) {
			list($plugin, $path) = $this->_View->pluginSplit($path, false);
		}

		if (!empty($options['pathPrefix']) && $path[0] !== '/') {
			$path = $options['pathPrefix'] . $path;
		}

		if (!empty($options['ext']) && strpos($path, '?') === false && substr($path, -strlen($options['ext'])) !== $options['ext']) {
			$path .= $options['ext'];
		}

		if (isset($plugin)) {
			$path = Inflector::underscore($plugin) . '/' . $path;
		}

		$path = $this->_encodeUrl($this->assetTimestamp($this->webroot($path)));
		$path = rtrim(Configure::read('App.assetsUrl'), '/') . '/' . ltrim($path, '/');

		$path = http_build_url($path, ['query' => 'v=' . Configure::read('App.current_version')], HTTP_URL_JOIN_QUERY);

		return $path;
	}