switch wordpress theme base on URL

Question

I have a wordpress website that host several themes inside it. Now I want to switch the themes for visitor base on the URL that they enter. for example :

my WP website is at http://www.myblog.com/wp/

but if user enter :

http://www.myblog.com/wp?theme=twentyten -> using twentyten theme

and if user enter :

http://www.myblog.com/wp?theme=mycustomtheme ->using mycustometheme

then is there any plugins available out there? I've been searching for days but no one seam to work for me.

Any suggestion is very appreciated!

Thanks

Answer 1

I haven't done it, and looking for a minute I don't see a plugin that does that for you. I think your best bet is to make a plugin that would change the theme variable based on the base URL. It's about as simple of a plugin as you can make, so it would be a good one to cut your teeth on if you have any programming ability whatsoever.

Answer 2

I've found this good tutorial about base theme swithing on URL.

First, you have to catch the parameter in the URL:

function sjc_add_query_vars($vars) 
{
    return array('template') + $vars;
}
add_filter('query_vars', 'sjc_add_query_vars');

And then you serve the template:

function sjc_template($template) 
{
    global $wp;
    if ($wp->query_vars['template']=='basic')
    {
        return dirname( __FILE__ ) . '/single-basic.php';
    }
    else 
    {
        return $template;
    }
}
add_filter('single_template', 'sjc_template');

Please note that the code above check if $wp->query_vars['template']=='basic' and not simply return the template specified in the URL, because it could be a security issue.

Answer 3

for who is still interested you have a WordPress functions that switches the theme

switch_theme( $stylesheet )

see https://codex.wordpress.org/Function_Reference/switch_theme

Just be care to call it in the right time, I would write it in a mu-plugin for use it.

Answer 4

This might help: http://codex.wordpress.org/Theme_Switching

There are 2 plugins noted in that url: http://wordpress.org/extend/plugins/theme-preview/ Theme preview which is what you want.

http://wordpress.org/extend/plugins/theme-switcher/ Theme switcher which do that too and create a sidebar widget so user can change the template.