fixed

Closes #3409234

filecache.inc

@@ -100,6 +100,27 @@ function filecache_registry_pathname() {
 
 class DrupalFileCache implements DrupalCacheInterface {
 
+   /**
+   * The cache bin name.
+   *
+   * @var string
+   */
+  protected $bin;
+
+  /**
+   * The cache directory.
+   *
+   * @var string
+   */
+  protected $directory;
+
+  /**
+   * Indicates whether the file cache directory is okay.
+   *
+   * @var bool
+   */
+  protected $ok;
+
   /**
    * Construct DrupalFileCache for specified cache bin.
    *