Force theme or disallow theme change

Lot of useless comments on this post from what seems like a pretty simple question.

change below $theme_directory_name="twentyfourteen"; to your theme… thats all you have to do. First function sets your theme no matter what. Second one disables interface to edit themes.

function selfish_hardcoded_theme() {
    $theme_directory_name="twentyfourteen";
    add_filter( 'template', create_function( '$template', 'return "' . $theme_directory_name . '";' ) );
    add_filter( 'stylesheet', create_function( '$stylesheet', 'return "' . $theme_directory_name . '";' ) );
}
add_action( 'setup_theme', 'selfish_hardcoded_theme', -1 );


add_filter( 'map_meta_cap', function( $required_caps, $cap ) {
    if ( 'edit_themes' == $cap || 'switch_themes' == $cap || 'install_themes' == $cap || 'delete_themes' == $cap || 'update_themes' == $cap ) {
        $required_caps[] = 'do_not_allow';
    }
    return $required_caps;
}, 10, 2 );

Theres other ways too :

$theme = wp_get_theme(); 
if ('twentyfourteen' !== $theme->name || 'twentyfourteen' !== $theme->parent_theme) { 
    switch_theme( 'twentyfourteen' );
}

You can also set the default theme constant in your wp-config.

Lastly, remove themes menu from admin:

function remove_themes_submenus() {
  global $submenu;
  unset($submenu['themes.php'][5]); // Removes 'Themes'
  unset($submenu['themes.php'][15]); // Removes Theme Installer tab
}
add_action('admin_menu', 'remove_themes_submenus');

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