how to add custom link on wordpress admin sidebar

Question

How to add custom link on wordpress admin sidebar without using plugins? For example, i want to add "Google.com" link. How should i do this?

I tried this: Added next code to admin-bar.php

function mycustomlink() {
global $wp_admin_bar;
$wp_admin_bar->add_menu( array(
    'parent' => 'new-content',
    'id' => 'mycustomlinkId',
    'title' => __('Custom link'),
    'href' => admin_url( 'google.com'),
    'meta' => false 
));}

And added next code to class-wp-admin-bar.php

add_action( 'admin_bar_menu', 'mycustomlink', 900 );

but no results.

Answer 1

Add this to the bottom of your theme's function.php

    add_action( 'admin_menu', 'linked_url' );
    function linked_url() {
    add_menu_page( 'linked_url', 'External link', 'read', 'my_slug', '', 'dashicons-text', 1 );
    }

    add_action( 'admin_menu' , 'linkedurl_function' );
    function linkedurl_function() {
    global $menu;
    $menu[1][2] = "http://www.example.com";
    }

Answer 2

For absolute links, just add this hook to your functions.php file:

add_action('admin_menu', 'add_custom_menu_link');
function add_custom_menu_link()
{
    add_menu_page('my_custom_link_1', 'Google', 'read', 'https://google.com/', '', 'dashicons-text', 1);
}

It also works for relative links, but you'll need to replace the initial slash with the HTML entity / to prevent WordPress from stripping it out.

So, for example, you would have to use /books/563 instead of /books/563.

add_action('admin_menu', 'add_custom_menu_link');
function add_custom_menu_link()
{
    add_menu_page('my_custom_link_1', 'Google', 'read', "/books/563", '', 'dashicons-text', 1);
}