change WP login logo

functions.php

/**  change admin login logo **/
function custom_loginlogo() {
echo '<style type="text/css">
body.login div#login h1 a  {background-image: url('.get_bloginfo('home').'/wp-content/themes/the-theme/images/admin-logo.png) !important; }
</style>';
}
add_action('login_head', 'custom_loginlogo');
  /*  -- changes the url of login logo -- */
function my_login_logo_url() {
    return get_bloginfo( 'url' );
}
add_filter( 'login_headerurl', 'my_login_logo_url' );

function my_login_logo_url_title() {
    return 'the site name';
}
add_filter( 'login_headertitle', 'my_login_logo_url_title' );