add users to all sites using the their same role

The code I used but not worked :

add_action('wp','add_current_user_to_blog',10);

function add_current_user_to_blog(){
	if(!is_user_logged_in())
		return false;
	global $current_user, $blog_id;
    switch_to_blog(1); //get role from main blog
    $user_Role = ($current_user->data->wp_capabilities);
	$add_Role = key($user_Role);
    restore_current_blog();
	if (!is_blog_user()) //check for current membership
		add_user_to_blog($blog_id, $current_user->ID, $add_Role); //copy to current blog so roles work
}