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This page, if duplicated across themes, allows you to cycle between them.  
It is possible to limit the themes available for this loop (see comment note).

> **Take care**  :    
> This affects the whole website (as it override the site config), not just the current user visiting the page. 
> If you want a more powerfull solution take a look at : [Hounddd.ThemeSwitcher](https://github.com/Hounddd/wn-themeswitcher-plugin) plugin.
	
```twig
title = "Theme switch"
url = "/switch-theme"
layout = "default"
is_hidden = 0
==
<?php
    function onStart()
    {
        use Cms\Classes\Theme;
        use Redirect;

$themes = collect(array_pluck(Theme::all(), 'dirName'));
        /**
         * Use the above syntax to limit the availaibles themes
         * to those specified
         */
        /*
        $themes = collect([
            'first-theme-code',
            'other-theme-code',
        ]);
        */

$currentThemeKey = $themes->search(Theme::getActiveThemeCode());

$nextThemeKey = $currentThemeKey +1;
        if ($nextThemeKey > $themes->count() -1) {
            $nextThemeKey = 0;
        }

$nextTheme = $themes->only($nextThemeKey)->first();
        Theme::setActiveTheme($nextTheme);

return Redirect::to('/');
    }
?>
==

```

If only two themes are defined, the page behaves like a "theme switcher".

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Topics

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Backend Plugin Development CMS Twig Themes Deployment