只允许管理员访问WordPress后台

/**
 * 重置非管理员用户到首页
 * https://www.wpdaxue.com/only-allow-administrators-to-access-wordpress-admin-area.html
 */
function redirect_non_admin_users() {
	if ( ! current_user_can( 'manage_options' ) && '/wp-admin/admin-ajax.php' != $_SERVER['PHP_SELF'] ) {
		wp_redirect( home_url() );
		exit;
	}
}
add_action( 'admin_init', 'redirect_non_admin_users' );