Usage of variables in php

The usage of variables in php obtains the sales amount and sales quantity of each region from the database. sum the quantity and amount. The code is as follows: & lt ;? PHPob_start (); require_once & nbsp; 'DB. php'; ob_end_clean (); & nbsp; & n usage of variables in php
Obtain the sales amount and sales quantity of each region from the database, and sum the quantity and amount. The code is as follows:

 
Ob_start ();
Require_once 'DB. php ';
Ob_end_clean ();
$ Db = DB: Connect ();
$ Result = $ db-> QueryLastMonth ();
$ Result1 = $ db-> QueryLastMonthByArea ();
$ All_sales_amount;
$ All_sales_money;
Echo 'begin'. $ all_sales_amount;
While ($ row1 = sybase_fetch_assoc ($ result1 ))
{
?>


 
  Switch ($ row1 ["areacode"]) {
  
Case "E ":
  
Echo "East China ";
  
Break;
  
Case "C ":
  
Echo "Northeast region ";
  
Break;
  
Case "N ":
  
Echo "North China ";
  
Break;
  
Case "W ":
  
Echo "West Region (W )";
  
Break;
  
Case "H ":
  
Echo "Central China ";
  
Break;
  
Case "S ":
  
Echo "South China ";
  
Break;
  
Case "F ":
  
Echo "East China (distribution )";
  
Break;
  
Case "T ":
  
Echo "West Region (T )";
  
Break;
  
}
  
?>
  

  
   
   

   
    
    

    
     
--
     

     
      
--
      

      

      

      $ All_sales_amount + = $ row1 ["area_salesgoodssum"];
      
$ All_sales_money + = $ row1 ["area_salesmoney"];
      
Echo 'number in a loop '. $ all_sales_amount. "amount". $ all_sales_money ."
      
";
      
}
      
?>
      

      

      

      

      

      

      
Sales briefing
      
      
Total amount:
       
      

      
Total quantity:
       
      

     
    
   
  
 

$ All_sales_amount indicates the sales quantity, and $ all_sales_money indicates the sales amount. However, the result of calculating the sales quantity in the running result is incorrect. the sales amount is always 0 (as shown below). What is the problem with the above code?
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