From 29ceb0c78a641a2c936432d32582903562eced80 Mon Sep 17 00:00:00 2001
From: Jeroen De Dauw <jeroendedauw@users.mediawiki.org>
Date: Mon, 30 Jan 2012 12:52:31 +0000
Subject: [PATCH] add hook that allows changing the check to see if a page
 exists or not

---
 includes/Title.php | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/includes/Title.php b/includes/Title.php
index b91c55c1d8..fd72309c2f 100644
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -28,7 +28,8 @@
  *
  * @internal documentation reviewed 15 Mar 2010
  */
-class Title {
+class
+Title {
 	/** @name Static cache variables */
 	// @{
 	static private $titleCache = array();
@@ -4164,7 +4165,21 @@ class Title {
 	 * @return Bool
 	 */
 	public function isKnown() {
-		return $this->isAlwaysKnown() || $this->exists();
+		$isKnown = null;
+
+		/**
+		 * Allows overriding default behaviour for determining if a page exists.
+		 * If $isKnown is kept as null, regular checks happen. If it's
+		 * a boolean, this value is returned by the isKnown method.
+		 *
+		 * @since 1.19
+		 *
+		 * @param Title $title
+		 * @param boolean|null $isKnown
+		 */
+		wfRunHooks( 'TitleIsKnown', array( $this, &$isKnown ) );
+
+		return is_null( $isKnown ) ? ( $this->isAlwaysKnown() || $this->exists() ) : $isKnown;
 	}
 
 	/**
-- 
2.20.1