Preventing Access wp-admin From Users

To more secure wordpress website can preventing access wp-admin from user. Only administrator can be access the site wp-admin.
For prevent access wp-admin from user just take below function in your theme functions.php file.

function jeba_blockusers_init() {
    if ( is_admin() && ! current_user_can( 'administrator' ) && 
       ! ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
        wp_redirect( home_url() );
        exit;
    }
add_action( 'init', 'jeba_blockusers_init' );
}

Note: Without administrator can give permission author and editor, for this just add author and editor beside administrator like current_user_can( ‘administrator’, ‘author’, ‘editor’ )