/**

 * WordPress 去除后台标题中的“—— WordPress”

 * http://www.wpdaxue.com/remove-wordpress-from-admin-title.html

 * 参考代码见 https://core.trac.wordpress.org/browser/tags/4.2.2/src/wp-admin/admin-header.php#L44

 */

add_filter('admin_title', 'wpdx_custom_admin_title', 10, 2);

function wpdx_custom_admin_title($admin_title, $title){

    return $title.' ‹ '.get_bloginfo('name');

}