Feature 1255: modification in sql queries

- manage random function
    - manage regex syntax
    - manage quote (single instead of double)
    - manage interval

git-svn-id: http://piwigo.org/svn/trunk@4367 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_notification.inc.php

@@ -463,7 +463,7 @@ SELECT DISTINCT id, path, name, tn_ext, file
   '.$where_sql.'
     AND date_available="'.$dates[$i]['date_available'].'"
     AND tn_ext IS NOT NULL
-  ORDER BY RAND(NOW())
+  ORDER BY '.DB_RANDOM_FUNCTION.'())
   LIMIT '.$max_elements.'
 ;';
       $dates[$i]['elements'] = array();