issue #1946 implement backend for search by date_posted

include/functions_search.inc.php

@@ -195,6 +195,17 @@ SELECT
     }
   }
 
+  if (!empty($search['fields']['date_posted']))
+  {
+    $options = array(
+      '7d' => '7 DAY',
+      '30d' => '30 DAY',
+      '6m' => '6 MONTH',
+      '1y' => '1 YEAR',
+    );
+    $clauses[] = 'date_available > SUBDATE(NOW(), INTERVAL '.$options[ $search['fields']['date_posted'] ].')';
+  }
+
   if (!empty($search['fields']['filetypes']))
   {
     $filetypes_clauses = array();

include/ws_functions/pwg.images.php

@@ -832,6 +832,16 @@ SELECT id
     $search['fields']['added_by'] = $params['added_by'];
   }
 
+  if (isset($params['date_posted']))
+  {
+    if (!preg_match('/^(7d|30d|6m|1y)$/', $params['date_posted']))
+    {
+      return new PwgError(WS_ERR_INVALID_PARAM, 'Invalid parameter date_posted');
+    }
+
+    $search['fields']['date_posted'] = $params['date_posted'];
+  }
+
   // register search rules in database, then they will be available on
   // thumbnails page and picture page.
   $query ='