Bugfix: add add_options method to callback class.

Author: georgmaisser

classes/filters/types/callback.php

@@ -134,4 +134,20 @@ public function filter_by_callback(array $records, $not = false) {
         }
         return $returnarray;
     }
+
+    /**
+     * This function takes a key value pair of options.
+     * Only if there are actual results in the table, these options will be displayed.
+     * The keys are the results, the values are the localized strings.
+     * For the standard filter, it's not necessary to provide these options...
+     * They will be gathered automatically.
+     *
+     * @param array $options
+     * @return void
+     */
+    public function add_options(array $options = []) {
+        foreach ($options as $key => $value) {
+            $this->options[$key] = $value;
+        }
+    }
 }