Accessing variable yet to be created - php

Question

I'm having some trouble here V_shop_menu $order_uuid is not populating. Now I'm guessing this is because its yet to be created this is done further below. The problem I have is there are 2 statements here doing inserts to tables but they both rely on each other.
I have a bit of chicken and egg situation as I need $shop_menu_uuid from the top area to complete the bottom insert. I was led to believe that as they are in the same public function it would just work but this is not the case.
What do I need to do to make this happen?
Thanks!
public function add_shopmenu(){
$postData = $this->input->post();
$condition['conditions'][] = "site_name ='".$this->sessionInfo['site']."'";
$site = $this->frontguide_Model->selectSingleRow("t_place",$condition);
$site_uuid = $site['site_uuid'];
unset($condition);
$condition['conditions'][] = "site_uuid ='".$site['site_uuid']."'";
$condition['conditions'][] = "shop_menu_name ='".$postData['shop_menu_name']."'";
$shopmenu_name = $this->frontguide_Model->selectData("v_shop_menus",$condition);
unset($condition);
$condition['conditions'][] = "site_uuid ='".$site['site_uuid']."'";
$shopmenus = $this->frontguide_Model->selectData("v_shop_menus",$condition);
$shop_menu_enabled = (isset($postData['shop_menu_enabled']))?$postData['shop_menu_enabled']:"false";
$shop_menu_uuid = $this->frontguide_functions->uuid();
$v_shop_menu= array(
"shop_menu_uuid" =>$shop_menu_uuid,
"site_uuid" =>$site_uuid,
"order_uuid" =>$order_uuid,
"shop_menu_extension" =>$shop_menu_extension,
"shop_menu_name" =>$postData['shop_menu_name'],
"shop_menu_greet_long" =>$postData['shop_menu_greet_long'],
"shop_menu_greet_short" =>$postData['shop_menu_greet_short'],
"shop_menu_timeout" =>$postData['shop_menu_timeout'],
"shop_menu_enabled" => $shop_menu_enabled,
"shop_menu_cid_prefix"=>$postData['shop_menu_cid_prefix']
);
log_message('debug',print_r($v_shop_menu,TRUE));
$vgu_response = $this->frontguide_Model->insert("v_shop_menus",$v_shop_menu);
$shop_menu_option_digits = $postData['shop_menu_option_digits'];
$shop_menu_option_order = $postData['shop_menu_option_order'];
$shop_menu_option_description = $postData['shop_menu_option_description'];
$shop_menu_option_param = $postData['shop_menu_option_param'];
for($i=0;$i<count($shop_menu_option_digits);$i++){
$option = array();
$option['shop_menu_option_digits'] = $shop_menu_option_digits[$i];
$option['shop_menu_option_order'] = $shop_menu_option_order[$i];
$option['shop_menu_option_description'] = $shop_menu_option_description[$i];
$option['shop_menu_option_param'] = $shop_menu_option_param[$i];
$shop_menu_option_uuid= $this->frontguide_functions->uuid();
$option['shop_menu_option_uuid'] = $shop_menu_option_uuid;
$option['shop_menu_uuid'] = $shop_menu_uuid;
$option['site_uuid'] = $site_uuid;
$vgu_response = $this->frontguide_Model->insert("v_shop_menu_options",$option);
}
$order_uuid = $this->frontguide_functions->uuid();
$order_data = array(
"site_uuid"=>$site_uuid,
"order_uuid"=>$order_uuid,
“offer_uuid" => "a6788e9b-67bc-bd1b-df59-ggg5d51289ab",
"order_context"=>$site['site_name'],
"order_name" =>$postData['shop_menu_name'],
"order_number" =>$shop_menu_extension,
"order_continue" =>'true',
"order_order" =>'333',
"order_enabled" =>"true",
);
$v_orders = $this->frontguide_Model->insert("v_orders",$order_data);

Answer 1

Now I'm guessing this is because its yet to be created this is done
further below.
Yes you are right.
It is quite simple.
Insert v_shop_menus data without $order_uuid .
after inserting in v_orders, get the $order_uuid and update the v_shop_menus using $shop_menu_uuid.