從mysql表獲得while（）循環量的累積總量（通過加法）

Question

我的查詢等工作完全正常，但我無法獲得一個變量中的結果總額回顯出來。

用我在下面，我一直得到一個0（零）金額在$ full_total;值。

while($row = mysql_fetch_array($all_donations)) { 
     $donation_date = date("m/d/Y", $row['date']); 
      echo "<tr><td>" . $donation_date ."</td><td>" . number_format($row['price'], 2) ."</td></tr>"; 

      $total_dontations = number_format($row['price'], 2); 
      $full_total += $total_donations; 
     } 
// echo this amount outside of the loop. 
echo $full_total; 

Answer 1

嘗試初始化full_total

$full_total = 0; 
while($row = mysql_fetch_array($all_donations)) { 
//... 

Answer 2

嘗試定義$full_total以上的while聲明是這樣的：

$full_total = 0; 
while($row = mysql_fetch_array($all_donations)) 
{ ... 

Answer 3

我認爲它與Using a variable outside of the while loop (scope)

similiar。根據該線程，你可以去這樣

$full_total = ""; 
while($row = mysql_fetch_array($all_donations)) { 
     $donation_date = date("m/d/Y", $row['date']); 
      echo "<tr><td>" . $donation_date ."</td><td>" . number_format($row['price'], 2) ."</td></tr>"; 

      $total_dontations = number_format($row['price'], 2); 
      $full_total += $total_donations; 
     } 
// echo this amount outside of the loop. 
echo $full_total;