--- /dev/null
+<?php
+
+interface SessionUpdateTimestampHandlerInterface
+{
+ /**
+ * Checks if a session identifier already exists or not.
+ *
+ * @param string $key
+ *
+ * @return bool
+ */
+ public function validateId($key);
+
+ /**
+ * Updates the timestamp of a session when its data didn't change.
+ *
+ * @param string $key
+ * @param string $val
+ *
+ * @return bool
+ */
+ public function updateTimestamp($key, $val);
+}