Title: [Plugin: Theme Switch and Preview] cleaning deprecated functions & stuff
Last modified: August 20, 2016

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# [Plugin: Theme Switch and Preview] cleaning deprecated functions & stuff

 *  [cardinalu](https://wordpress.org/support/users/cardinalu/)
 * (@cardinalu)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-theme-switch-and-preview-cleaning-deprecated-functions-stuff/)
 * Here are a couple of fixes you might want to include in the next release to avoid
   throwing “deprecated” notices from your plugin.
 * widget.php line 8
    Error: Use wp_register_sidebar_widget() instead. Deprecated
   in version 2.8. – replace register_sidebar_widget with wp_register_sidebar_widget
 * inc/admin.php line 7
    Error: Usage of user levels by plugins and themes is deprecated.
   Use roles and capabilities instead. Deprecated in version 2.0. – replace the 
   10 constant with ‘manage_options’
 * regards.
 * [http://wordpress.org/extend/plugins/nkthemeswitch/](http://wordpress.org/extend/plugins/nkthemeswitch/)

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 * 1 participant
 * Last reply from: [cardinalu](https://wordpress.org/support/users/cardinalu/)
 * Last activity: [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-theme-switch-and-preview-cleaning-deprecated-functions-stuff/)
 * Status: not resolved