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components/com_banners/helpers/banner.php

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+<?php
+/**
+ * @package     Joomla.Site
+ * @subpackage  com_banners
+ *
+ * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+/**
+ * @package     Joomla.Site
+ * @subpackage  com_banners
+ */
+abstract class BannerHelper
+{
+	/**
+	 * Checks if a URL is an image
+	 *
+	 * @param string
+	 * @return URL
+	 */
+	public static function isImage($url)
+	{
+		$result = preg_match('#\.(?:bmp|gif|jpe?g|png)$#i', $url);
+		return $result;
+	}
+
+	/**
+	 * Checks if a URL is a Flash file
+	 *
+	 * @param string
+	 * @return URL
+	 */
+	public static function isFlash($url)
+	{
+		$result = preg_match('#\.swf$#i', $url);
+		return $result;
+	}
+}