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I want to make an specific theme for non logged in users, but I don´t know how to make the function or plugin to shift the theme for them, and left another specific theme for logged in users.

Anyone knows how to do this? The only clues I had are the functions switch_theme and is_user_logged_in, but don´t know how to make them work to do this.

Thanks for your time.

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Functions - under the hood

While is_user_logged_in() can be used to determine the difference between a guest and a logged in (and therefore registered) user, switch_theme( $stylesheet ) alters actual database entries in the {$wpdb->options} table:

update_option( 'template', $template );
update_option( 'stylesheet', $stylesheet );
update_option( 'current_theme', $new_name );
if ( count( $wp_theme_directories ) > 1 ) {
    update_option( 'template_root', get_raw_theme_root( $template, true ) );
    update_option( 'stylesheet_root', get_raw_theme_root( $stylesheet, true ) );
} else {
    delete_option( 'template_root' );
    delete_option( 'stylesheet_root' );
update_option( 'theme_switched', $old_theme->get_stylesheet() );

Simple solution: Two stylesheets.

Therefore I wouldn't recommend doing so. Simply switch "themes" - read: loaded stylesheets - on a user/guest basis

$stylesheet  = plugins_dir_url( __FILE__ ).'assets/';
$stylesheet .= is_user_logged_in()
    ? 'style-user.css'
    : 'style-guest.css;
    array( 'commons.css' )

As you can see, I add a dependency of commons.css to the stylesheet. This would be another, previously registered/enqueued stylesheet that has all definitions that are shared between both.

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Like your two stylesheets method. +1 – Pieter Goosen Apr 25 '14 at 13:51

You can override the theme WordPress uses with the template and stylesheet filters:

 * Override the current theme to show non-logged in users.
 * @link    http://wordpress.stackexchange.com/q/142418/1685
 * @param   string  $theme
 * @return  string
function wpse_142418_nopriv_theme( $theme ) {
    if ( ! is_user_logged_in() ) 
        $theme = 'mythemefoldername';
    return $theme;

add_filter( 'stylesheet', 'wpse_142418_nopriv_theme' );
add_filter( 'template',   'wpse_142418_nopriv_theme' );
share|improve this answer
As @kaiser mentioned, switch_theme will make relentless updates to the DB. Using these filters will not. – TheDeadMedic Apr 25 '14 at 13:32
And that's why I upvoted you :) – kaiser Apr 25 '14 at 13:33
Works for child themes and parent themes? – Brad Dalton Apr 25 '14 at 15:14
If you just want to override a child theme, use only the stylesheet filter. – TheDeadMedic Apr 25 '14 at 15:19

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