Questions about the use of variables in PHP

Usage of variables in PHP
The sales amount and quantity of each district are obtained from the database, and the quantity and amount are summed. The code is as follows:

 
Ob_start ();
Require_once ' db.php ';
Ob_end_clean ();
$db =db::connect ();
$result = $db->querylastmonth ();
$result 1= $db->querylastmonthbyarea ();
$all _sales_amount;
$all _sales_money;
echo ' begin '. $all _sales_amount;
while ($row 1= Sybase_fetch_assoc ($result 1))
{
?>
  
                
 Switch ($row 1["AreaCode"]) {
Case "E":
echo "East";
Break
Case "C":
echo "North East District";
Break
Case "N":
echo "North China area";
Break
Case "W":
echo "West Region (W)";
Break
Case "H":
echo "Central China";
Break
Case "S":
echo "Southern Region";
Break
Case "F":
echo "East East (distribution)";
Break
Case "T":
echo "West Region (T)";
Break
}
?>
                
 
                
 
                --
                --
            


 $all _sales_amount+= $row 1["Area_salesgoodssum"];
$all _sales_money+= $row 1["Area_salesmoney"];
Echo ' Number of loops '. $all _sales_amount. " Amount ". $all _sales_money."
";
}
?>
        
    



    
Sales Briefing
 
Total Amount: 
    

Total Quantity: 
    

$all _sales_amount is the number of sales, $all _sales_money is the sales amount. But the result of running the sales quantity calculated the result is wrong, the sales amount is always 0 (below) What is wrong with the above code?

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------Solution--------------------
$all _sales_amount+= $row 1["Area_salesgoodssum"]; 43547
That's right.
The amount column shows $row 1["Area_salesmoneysum"]
Sum $all _sales_money+= $row 1["Area_salesmoney"];
$row 1["Area_salesmoneysum" and $row 1["Area_salesmoney" are the same?
You didn't say anything, I'm not saying much.
------Solution--------------------


$all _sales_money+= $row 1["Area_salesmoney"]; Change to $all_sales_money+= $row 1["Area_salesmoneysum"] should be OK.

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