add clear

wx/WxClient.php

@@ -23,6 +23,23 @@ class WxClient
 	const DELETE = 'delete';
 	const OPTIONS = 'option';
 
+	private static $_instance;
+
+	private function __construct()
+	{
+	}
+
+	/**
+	 * @return WxClient
+	 */
+	public static function getInstance()
+	{
+		if (!(static::$_instance instanceof WxClient)) {
+			static::$_instance = new WxClient();
+		}
+		return static::$_instance;
+	}
+
 	/**
 	 * @param string $host
 	 */