在PHP中乘以while循環的結果

Question

所以我在php中有一個while循環，我將每條記錄從mysql數據庫中拉出，效果很好，但是我現在要做的是將QTY列的結果加在一起以得到總數，但是我不是確保每次將while循環循環時如何將每個結果加在一起，從而擦除最后一個循環。

例如，如果我有以下記錄：

ID  QTY   NAME
1    2    BOX1
2    54   BOX2
3    21   BOX6

當我在while循環中將它們回顯時，它們的效果與上面相當。 我想做的是每次將QTY加到總計中，這樣我就可以獲得QTY總計，並將其用作$ totalQTY。

    $sql = <<<SQL
    SELECT * FROM `orders` WHERE `orderid` = '$view' AND `isline` = 'no'
    SQL;
    if(!$result = $db->query($sql)){ die('There was an error running the query [' . $db->error . ']');}
    while($row = $result->fetch_assoc()){
    echo '<h2>Order Id : '.$row['orderid'].'</h2>';
    echo '<p><strong>Customer Order Number : '.$row['customerordernumber'].'</strong></p>';
    echo '<p><strong>Order Date :</strong> '.date("d/m/Y H:i:s", strtotime($row["orderdatetime"])).'</p>';
    echo '<p><strong>Order Notes :</strong> '.$row['ordernotes'].'</p>';
    echo '<p><strong>Label Type :</strong> '.$row['labeltype'].'</p>';
    echo '<p><strong>Trolley Type :</strong> '.$row['trolleytype'].'</p>';
    echo '<p><strong>Deliver By :</strong> '.$row['deliverby'].'</p>';
    echo '<p><strong>Ordered Items : </strong></p>';
    }

Answer 1

在循環外創建一個變量，並將其遞增：

$count=0
while($row = $result->fetch_assoc()){
     $count+=$row['quantity'];
}
echo $count;

Answer 2

只需按照您寫的內容做即可：

$totalQTY = 0
while (....) {
   //...all your code....
   $totalQTY += $row['QTY']; // you didn't give the name of the column
}

Answer 3

$sql = <<<SQL
SELECT * FROM `orders` WHERE `orderid` = '$view' AND `isline` = 'no'
SQL;
if(!$result = $db->query($sql)){ die('There was an error running the query [' .$db->error . ']');}
$totalqty=0; // add this
while($row = $result->fetch_assoc()){
echo '<h2>Order Id : '.$row['orderid'].'</h2>';
echo '<p><strong>Customer Order Number : '.$row['customerordernumber'].'</strong></p>';
echo '<p><strong>Order Date :</strong> '.date("d/m/Y H:i:s", strtotime($row["orderdatetime"])).'</p>';
echo '<p><strong>Order Notes :</strong> '.$row['ordernotes'].'</p>';
echo '<p><strong>Label Type :</strong> '.$row['labeltype'].'</p>';
echo '<p><strong>Trolley Type :</strong> '.$row['trolleytype'].'</p>';
echo '<p><strong>Deliver By :</strong> '.$row['deliverby'].'</p>';
echo '<p><strong>Ordered Items : </strong></p>';
$totalqty+=intval($row['QTY??']); //your field value must be changed add this
}

只需添加一個計數器變量如上:)