Predefine string variable we plan on adding to

phpSmug.php

@@ -849,6 +849,7 @@ private function generate_signature( $apicall, $apiargs = NULL )
 		    uksort( $params, 'strnatcmp' );
 			// We can't use implode() here as it plays havoc with array keys with empty values.
 			$count = count( $params );
+			$string = '';
 			foreach ( $params as $key => $value ) {
 				$count--;
 				$string .= $key . '=' . $value;
@@ -1536,4 +1537,4 @@ private function _unchunk( $body )
 	}
 }
 
-?>
+?>