1 files changed, 23 insertions, 0 deletions
diff --git a/inc/changelog.php b/inc/changelog.php
index de26fdf6a..0a33f6a6e 100644
--- a/inc/changelog.php
+++ b/inc/changelog.php
@@ -814,3 +814,26 @@ function getRevisions($id, $first, $num, $chunk_size=8192, $media=false) {
     $log = new PageRevisionLog($id, $chunk_size);
     return $log->getRevisions($first, $num, $media);
 }
+
+/**
+* Return an existing revision for a specific date which is 
+* the current one or less or equal then the date
+*
+* @param string $id 
+* @param number $date_at
+* @param boolean $media
+* @return string revision ('' for current)
+*/
+function getProperRevision($id,$date_at,$media = false){
+    $create_time = @filemtime($media?mediaFN($id):wikiFN($id));
+    if(((int)$date_at) >= $create_time) { //requestet REV older then time($id) => load current
+        return '';
+    } else {
+        $log = new PageRevisionLog($id);
+        if($rev = $log->getRelativeRevision($date_at+1, -1,$media)) {
+            return $rev;
+        } else {
+            return false;
+        }
+    }
+}
+\ No newline at end of file