php - How to force Wordpress admin/login pages with SSL? -

i have wordpress in sub-domain blog.my-site.com , can't use ssl sub-domains (https:// blog.my-site.com)

is there way force wordpress admin/login pages ssl url https:// www.my-site.com/blog_dir/wp-admin/ (the folder name not same sub-domain)

to force administration , logins on ssl, proper way set force_ssl_admin constant in wp-config.php.

define( 'force_ssl_admin', true );