Theme Preview Plugin

By default, the only way to see how a new theme looks on your site is to
activate it, making it visible to everyone who visits. With this plugin, it
is possible to view how a new theme looks without activating it.

TODO

Possible future enhancements:

• Add an options screen.
• Allow choice of theme to preview from a known list of installed themes.
• Provide persistent previews by setting a cookie.
• Restrict preview ability by user Roles/Capabilities.
• Child-theme friendliness.

Notes

May not work properly with child themes. This is because it will not be able
to inherit from the parent theme as it normally would.

1. Upload the theme-preview folder and its contents to your wp-contents/plugins directory.
2. Activate in the Plugins menu.
3. Visit your site with a special parameter added to the URL

Add query variables preview_theme and/or preview_css to your query
string. For example, if you have a theme named “My Theme”, which is
installed in your wp-content/themes/my-theme directory, add the theme’s
directory name to your URL like this:

http://example.com/index.php?preview_theme=my-theme 

Sometimes, you create a new look for your site by just making new CSS, but
you keep the existing PHP files intact. In that case, you con use the
preview_css variable instead of preview_theme, or use them both
together, like this:

http://example.com/index.php?preview_theme=default&preview_css=my-theme 

1.4 2016-02-17

• SECURITY: Eliminate directory traversal, limit themes to registered directories.

1.3 2015-08-26

• Fixed to work with newer versions of WordPress.

1.2 2010-01-14

• Tested with WordPress 3.0-alpha