WP Conditional Themes

A simple API to switch the themes on certain conditions.

Usage

Write an another plugin file and use the Conditional Themes API as the example below:

add_action('plugins_loaded', 'my_conditional_themes_setup', 100);

function my_conditional_themes_setup()
{
    // Switch to Twenty Eleven theme if the visitor use Internet Explorer.
    Conditional_Themes_Manager::register('twentyeleven', function() {
        global $is_IE;
        return (bool) $is_IE;
    });

    // Switch to Twenty Thirteen theme if the user has administrator role.
    Conditional_Themes_Manager::register('twentythirteen', function() {
        return current_user_can('administrator');
    });

    // Switch to a custom theme if the visitor use a mobile device.
    Conditional_Themes_Manager::register('mobile', 'wp_is_mobile');
}

Another example, With enabling persistent mode.

add_action('plugins_loaded', 'my_conditional_themes_setup', 100);

function my_conditional_themes_setup()
{
    // Enable the switcher persistent mode.
    Conditional_Themes_Manager::set_option('persistent', true);

    // Switch to Twenty Sixteen theme when we being on 2016.
    Conditional_Themes_Manager::register('twentysixteen', function() {
        return (date('Y') == 2016);
    });

    // Switch to Twenty Fifteen theme when the site reaches 500 post.
    Conditional_Themes_Manager::register('twentyfifteen', function() {
        return ((int) wp_count_posts() > 500);
    });
}