Clear cache when posts are hidden

qa-include/app/post-update.php

@@ -427,6 +427,8 @@ function qa_question_set_status($oldquestion, $status, $userid, $handle, $cookie
 		}
 	}
 
+	qa_question_uncache($oldquestion['postid']); // remove hidden posts immediately
+
 	$eventparams = array(
 		'postid' => $oldquestion['postid'],
 		'parentid' => $oldquestion['parentid'],
@@ -618,6 +620,18 @@ function qa_post_unindex($postid)
 
 
 /**
+ * Delete the cache for a question. Used after it or its answers/comments are hidden, to prevent them remaining visible to visitors/search engines.
+ * @param int $questionId Post ID to delete.
+ * @return bool
+ */
+function qa_question_uncache($questionId)
+{
+	$cacheDriver = Q2A_Storage_CacheFactory::getCacheDriver();
+	return $cacheDriver->delete("question:$questionId");
+}
+
+
+/**
  * Change the fields of an answer (application level) to $content, $format, $notify and $name, then reindex based on
  * $text. For backwards compatibility if $name is null then the name will not be changed. Pass the answer's database
  * record before changes in $oldanswer, the question's in $question, and details of the user doing this in $userid,
@@ -801,6 +815,8 @@ function qa_answer_set_status($oldanswer, $status, $userid, $handle, $cookieid,
 		}
 	}
 
+	qa_question_uncache($question['postid']); // remove hidden posts immediately
+
 	$eventparams = array(
 		'postid' => $oldanswer['postid'],
 		'parentid' => $oldanswer['parentid'],
@@ -1182,6 +1198,8 @@ function qa_comment_set_status($oldcomment, $status, $userid, $handle, $cookieid
 			$oldcomment['format'], qa_viewer_text($oldcomment['content'], $oldcomment['format']), null, $oldcomment['categoryid']);
 	}
 
+	qa_question_uncache($question['postid']); // remove hidden posts immediately
+
 	$eventparams = array(
 		'postid' => $oldcomment['postid'],
 		'parentid' => $oldcomment['parentid'],