joomla/joomla-cms — pull request #2605 by fastslack (2013-11-27 02:11:38+00:00)
Title: Select list feature for comma-separated selected values

With this patch, we can save the multiple values from select inputs using comma-separated directly into the database.

When we save the multiple values into out database we can use this code into our save method on model:
```
// Comma-separated multiple values
$data['multiple_select'] = implode(",", $data['multiple_select']);
```