1 files changed, 19 insertions, 1 deletions
diff --git a/Auth/OpenID/Message.php b/Auth/OpenID/Message.php
index a9a7d21..cdc4d65 100644
--- a/Auth/OpenID/Message.php
+++ b/Auth/OpenID/Message.php
@@ -74,7 +74,7 @@ function Auth_OpenID_registerNamespaceAlias($namespace_uri, $alias)
         return false;
     }
 
-    if (in_array($alias, $Auth_OpenID_registered_aliases)) {
+    if (in_array($alias, array_keys($Auth_OpenID_registered_aliases))) {
         return false;
     }
 
@@ -83,6 +83,24 @@ function Auth_OpenID_registerNamespaceAlias($namespace_uri, $alias)
 }
 
 /**
+ * Removes a (namespace_uri, alias) registration from the global
+ * namespace alias map.  Returns true if the removal succeeded; false
+ * if not (if the mapping did not exist).
+ */
+function Auth_OpenID_removeNamespaceAlias($namespace_uri, $alias)
+{
+    global $Auth_OpenID_registered_aliases;
+
+    if (Auth_OpenID::arrayGet($Auth_OpenID_registered_aliases,
+                              $alias) === $namespace_uri) {
+        unset($Auth_OpenID_registered_aliases[$alias]);
+        return true;
+    }
+
+    return false;
+}
+
+/**
  * An Auth_OpenID_Mapping maintains a mapping from arbitrary keys to
  * arbitrary values.  (This is unlike an ordinary PHP array, whose
  * keys may be only simple scalars.)