Fix 'Only variables should be passed by reference' notices in PHP7

index.php

@@ -198,7 +198,8 @@
 		else if ($_SERVER['REQUEST_METHOD'] == 'PUT') #add a single record to the server
 		{
 			$wbo = new wbo();
-			if (!$wbo->extract_json(get_json()))
+			$json = get_json();
+			if (!$wbo->extract_json($json))
 				report_problem(WEAVE_ERROR_JSON_PARSE, 400);
 
 			check_quota($db);

weave_storage.php

@@ -737,10 +737,11 @@ class WeaveStorage
         try
         {
             $update_statement = "update users set login = :logintime where username = :username";
+            $time = time();
 
             $sth = $this->_dbh->prepare($update_statement);
             $sth->bindParam(':username', $username);
-            $sth->bindParam(':logintime', time());
+            $sth->bindParam(':logintime', $time);
             $sth->execute();
         }
         catch( PDOException $exception )