<?php    /**     * Appender allows you to log messags to any location. Every appender has its own layout	 * that specifies the format of the messages, and every appender has a target location for messages.	 * This way, we can have an appender that writes log messages to a database, another one that writes	 * messages to a file, etc.	 *	 * @see LoggerManager	 * @see Logger	 * \ingroup logger	      */    class Appender    {        /**         * The layout to be used for this appender.         */        var $layout;				/**		 * used to keep the properties		 * @private		 */		var $_properties;        /**         * Create a new Appender instance.         *         * @param Layout A Layout instance.         */        function Appender(&$layout, $properties)        {            $this->layout =& $layout;						$this->_properties = $properties;        }        /**         * Retrieve the layout this appender is using.         *         * @return Layout A Layout instance.         */        function & getLayout ()        {            return $this->layout;        }        /**         * Set the layout this appender will use.         *         * @param Layout A Layout instance.         */        function setLayout (&$layout)        {            $this->layout =& $layout;        }        /**         * Write to this appender.         *         * <br/><br/>         *         * <note>         *     This should never be called manually.         * </note>         *         * @param message The message to write.         */        function write ($message)        {            throw(new Exception("Appender::write: This method must be implemented by child classes."));            die();        }    }?>