WordPress custom login logo code.

Login Logo Customization

// Change login logo
add_action('login_head',  'rgt_custom_dashboard_logo');
function rgt_custom_dashboard_logo() {
	echo '<style  type="text/css">
		.login h1 a {
		background-image:url('.get_stylesheet_directory_uri().'/images/logo.png)  !important;
		background-size: 215px 138px  !important; 
		width: 215px  !important;
		height: 138px  !important;
		}
	</style>';
}
 
// Change login link
add_filter('login_headerurl','loginpage_custom_link');
function loginpage_custom_link() {
	return get_site_url();
}