我的2個總共r彼此混淆我怎麼能分開他們？

Question

我要創建一個在線卡交換商店，他們可以購買和出售他們的卡，所以我製作了2個購物車系統。 1用於傳入卡和1用於傳出卡。一切都進展順利接受總數。這裏是我的代碼，請幫助我。

<?php 
// cart function for card in 
function cardin() { 
foreach($_SESSION as $name => $value) { 
     if ($value >0) { 
      if (substr($name, 0, 5)=='cain_') { 
       $id = substr($name, 5, (strlen($name)-5)); 
       $get = mysql_query('SELECT id, name, inprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
       while ($get_row = mysql_fetch_assoc($get)){ 
        $sub = $get_row['inprice']*$value; 
       echo '<table align="center" width="900" border="1"> 
    <tr> 
    <td width="382" align="center">'.$get_row['name'].'</td> 
    <td width="89" align="center">'.$value.'</td> 
    <td width="121" align="center">' .$get_row['inprice'].'</td> 
    <td width="124" align="center">'.$sub.'</td> 
    <td width="79" align="center"><a href="cart.php?removein='.$id.'">[-]</a></td> 
    <td width="79" align="center"><a href="cart.php?addin='.$id.'">[+]</a></td> 
    </tr> 
</table>'; 
       } 
      } 
     } 
    } 
} 
// cart funciotn for out 
function cardout() { 
foreach($_SESSION as $name => $value) { 
     if ($value >0) { 
      if (substr($name, 0, 5)=='caou_') { 
       $id = substr($name, 5, (strlen($name)-5)); 
       $get = mysql_query('SELECT id, name, outprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
       while ($get_row = mysql_fetch_assoc($get)){ 
        $sub = $get_row['outnprice']*$value; 
       echo '<table align="center" width="900" border="1"> 
    <tr> 
    <td width="382" align="center">'.$get_row['name'].'</td> 
    <td width="89" align="center">'.$value.'</td> 
    <td width="121" align="center">' .$get_row['outprice'].'</td> 
    <td width="124" align="center">'.$sub.'</td> 
    <td width="79" align="center"><a href="cart.php?removeout='.$id.'">[-]</a></td> 
    <td width="79" align="center"><a href="cart.php?addout='.$id.'">[+]</a></td> 
    </tr> 
</table>'; 
       } 
      } 
     } 
    } 
} 
/////total function/////// 
///////////////////////// this is my problem //////////////// 
// totalin funciotn similar to cart funciont only doing for return the total ////////////// 
function totalin() { 
    foreach($_SESSION as $name => $value) { 
     if ($value >0) { 
      if (substr($name, 0, 5)=='cain_') { 
       $id = substr($name, 5, (strlen($name)-5)); 
       $get = mysql_query('SELECT id, inprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
       while ($get_row = mysql_fetch_assoc($get)){ 
        $sub = $get_row['inprice']*$value; 
       } 
      } 
      $total += $sub; 
     } 
    } 
    return $total; 
} 
//////total out function 
function totalout() { 
    foreach($_SESSION as $name => $value) { 
     if ($value >0) { 
      if (substr($name, 0, 5)=='caou_') { 
       $id = substr($name, 5, (strlen($name)-5)); 
       $get = mysql_query('SELECT id, outprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
       while ($get_row = mysql_fetch_assoc($get)){ 
        $sub = $get_row['outprice']*$value; 
       } 
      } 
      $total += $sub; 
     } 
    } 
    return $total; 
} 

$balance = totalin() - totalout(); 
echo $balance; 

我該如何解決我的問題？這是我的第一個網站，所以我不知道更多關於如此請幫助我的人。請用代碼回答//請/ /請/ /請。

Answer 1

我看不到你在哪裏宣佈$total，所以也許你正在爲此使用全球？只需讓這些當地人進入你的全部功能。

如果你沒有使用全局變量，並且在第一次賦值時只聲明$total，那麼你可能會收到一個「Undefined variable」警告。

---

編輯：這裏就是我將修改現有的總功能：

function totalin() { 
    $tin=0; 
    foreach($_SESSION as $name => $value){ 
     if($value >0 && substr($name, 0, 5) == 'cain_') { 
      $id = substr($name, 5, (strlen($name)-5)); 
      $get = mysql_query('SELECT id, inprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
      while ($get_row = mysql_fetch_assoc($get)){ 
       $sub = $get_row['inprice']*$value; 
       $tin += $sub; 
      } 
     } 
    } 
    return $tin; 
} 

function totalout() { 
    $tout=0; 
    foreach($_SESSION as $name => $value) { 
     if ($value >0 && substr($name, 0, 5)=='caou_'){ 
      $id = substr($name, 5, (strlen($name)-5)); 
      $get = mysql_query('SELECT id, outprice FROM cards WHERE id='.mysql_real_escape_string((int)$id)); 
      while ($get_row = mysql_fetch_assoc($get)){ 
       $sub = $get_row['outprice']*$value; 
       $tout += $sub; 
      } 
     } 
    } 
    return $tout; 
}