File functions.php của theme Wordpress

<?php
//Tao menu
 function tao_menu() {
    register_nav_menus (
        array   ('top-menu' => __('Top Menu'),
                 'main-menu' => __('Main menu'),
                )
    );
}
add_action('init','tao_menu');
//Bat chuc nang Featured Image
add_theme_support( 'post-thumbnails' );
//Tuy chinh do dai noi dung bai viet trang chu
function custom_excerpt_length( $length ) {
    return 80;
}
add_filter ('excerpt_length','custom_excerpt_length','999');
function new_excerpt_more( $more ) {
    return ' <a class="more-link" href="'. get_permalink( get_the_ID() ) . '"> Xem thêm</a>';
}
add_filter( 'excerpt_more', 'new_excerpt_more' );
//Tao sidebar
if (function_exists('register_sidebar'))
    register_sidebar( array(
    'name' =>'Sidebar',
    'id' => 'sidebar',
    'before_widget' => '',
    'after_widget' => '',
    'before_title' => '<h4 class="widet-title">',
    'after_title' => '</h4>',
    ) );
register_sidebar( array(
    'name' =>'Footer Widget 1',
    'id' => 'footer-widget-1',
    'before_widget' => '',
    'after_widget' => '',
    'before_title' => '<h4 class="widget-title">',
    'after_title' => '</h4>',
    ) );
register_sidebar( array(
    'name' =>'Footer Widget 2',
    'id' => 'footer-widget-2',
    'before_widget' => '',
    'after_widget' => '',
    'before_title' => '<h4 class="widget-title">',
    'after_title' => '</h4>',
    ) );
register_sidebar( array(
    'name' =>'Footer Widget 3',
    'id' => 'footer-widget-3',
    'before_widget' => '',
    'after_widget' => '',
    'before_title' => '<h4 class="widget-title">',
    'after_title' => '</h4>',
    ) );
?>