diff --git a/wx/Help.php b/wx/Help.php
index a084675..b91d554 100644
--- a/wx/Help.php
+++ b/wx/Help.php
@@ -74,14 +74,14 @@ class Help extends Miniprogarampage
 	public static function sign(array $array, $key, $type)
 	{
 		ksort($array, SORT_STRING);
-		$string = '';
-		foreach ($array as $key => $val) {
-			if (empty($string)) {
-				$string = $key . '=' . $val;
-			} else {
-				$string .= '&' . $key . '=' . $val;
-			}
-		}
+		$string = http_build_query($array);
+//		foreach ($array as $key => $val) {
+//			if (empty($string)) {
+//				$string = $key . '=' . $val;
+//			} else {
+//				$string .= '&' . $key . '=' . $val;
+//			}
+//		}
 		$string .= '&key=' . $key;
 
 		if ($type == 'MD5') {