Merge "Document WAN cache FLD_* constants"

diff --git a/includes/libs/objectcache/WANObjectCache.php b/includes/libs/objectcache/WANObjectCache.php
index 847b4c2..470a38c 100644 (file)
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -110,12 +110,12 @@ class WANObjectCache implements IExpiringStore, LoggerAwareInterface {
        /** Cache format version number */
        const VERSION = 1;
 
-       const FLD_VERSION = 0;
-       const FLD_VALUE = 1;
-       const FLD_TTL = 2;
-       const FLD_TIME = 3;
-       const FLD_FLAGS = 4;
-       const FLD_HOLDOFF = 5;
+       const FLD_VERSION = 0; // key to cache version number
+       const FLD_VALUE = 1; // key to the cached value
+       const FLD_TTL = 2; // key to the original TTL
+       const FLD_TIME = 3; // key to the cache time
+       const FLD_FLAGS = 4; // key to the flags bitfield
+       const FLD_HOLDOFF = 5; // key to any hold-off TTL
 
        /** @var integer Treat this value as expired-on-arrival */
        const FLG_STALE = 1;