注意：在循環拋出對象的數組用foreach

Question

未定義抵消我有以下對象數組：

Array 
(
    [0] => Array 
     (
      [0] => stdClass Object 
       (
        [Sales] => 4 
       ) 

      [1] => stdClass Object 
       (
        [Sales] => 6 
       ) 

      [2] => stdClass Object 
       (
        [Sales] => 5 
       ) 

     ) 

    [1] => Array 
     (
      [0] => stdClass Object 
       (
        [Sales] => 8 
       ) 

      [1] => stdClass Object 
       (
        [Sales] => 7 
       ) 

      [2] => stdClass Object 
       (
        [Sales] => 7 
       ) 

     ) 

    [2] => Array 
     (
      [0] => stdClass Object 
       (
        [Sales] => 5 
       ) 

      [1] => stdClass Object 
       (
        [Sales] => 7 
       ) 

      [2] => stdClass Object 
       (
        [Sales] => 6 
       ) 

     ) 

    [3] => Array 
     (
      [0] => stdClass Object 
       (
        [Sales] => 5 
       ) 

      [1] => stdClass Object 
       (
        [Sales] => 6 
       ) 

      [2] => stdClass Object 
       (
        [Sales] => 6 
       ) 

     ) 

    [4] => Array 
     (
      [0] => stdClass Object 
       (
        [Sales] => 4 
       ) 

      [1] => stdClass Object 
       (
        [Sales] => 5 
       ) 

      [2] => stdClass Object 
       (
        [Sales] => 11 
       ) 

     ) 

) 

我想在每個對象的總銷售額。所以我寫了這個代碼：

public function getChannelsSales ($ChannelSales) { 
     $totalChannelSales = array(); 
     $i = 0; 
     foreach ($ChannelSales as $ChSales) { 
      foreach ($ChSales as $value) { 
       $totalChannelSales[$i] = $totalChannelSales [$i] + $value->Sales; 
      } 
      ++$i; 
     } 
     return $totalChannelSales; 
} 

運行代碼我得到正確的答案後：

Array 
(
    [0] => 15 
    [1] => 22 
    [2] => 18 
    [3] => 17 
    [4] => 20 
) 

但是我得到的也是在froint結尾出現下列信息：

Notice: Undefined offset: 0 in ...\Sales.php on line 174 
Notice: Undefined offset: 1 in ...\Sales.php on line 174 
Notice: Undefined offset: 2 in ...\Sales.php on line 174 
Notice: Undefined offset: 3 in ...\Sales.php on line 174 
Notice: Undefined offset: 4 in ...\Sales.php on line 174 

線174是這一個：

$totalChannelSales[$i] = $totalChannelSales[$i] + $value->Sales; 

而且即使答案是正確的，我也不知道問題出在哪裏（因爲你可以總結自己）

任何想法？

編輯：

我已經

 $totalChannelSales[0] = 0; 

• 創建陣列之後。一旦與第一的foreach
• 之前在兩者之間的第二時間增加兩倍的線得到的溶液對於每個AFTER的第一個foreach結束

Answer 1

數組將從循環中逐個填充您的值。你不需要添加它。

使用下面的代碼。

$totalChannelSales[$i] = $value->Sales; 

Answer 2

我猜你的問題是在這裏

$totalChannelSales[$i] = $totalChannelSales [$i] + $value->Sales; 

您正在嘗試設置甚至不存在，您可以使用array_push這一點，它會推元素和迭代指標指數。

Answer 3

我將帶您通過您的代碼找出錯誤：在上面的代碼

foreach ($ChannelSales as $ChSales) { 
     foreach ($ChSales as $value) { 
      $totalChannelSales[$i] = $totalChannelSales [$i] + $value->Sales; 
     } 
     ++$i; 
    } 

現在讓我們說在$ I = 0你是第一個環和當時$totalChannelSales[$i] = $totalChannelSales [$i] + $value->Sales;會$totalChannelSales[0] = $totalChannelSales [0] + $value->Sales;所以將獲取$ totalChannelSales [0]值，該值在此時不存在，對於其他$ i值也是如此。

Answer 4

$totalChannelSales[$i] = $totalChannelSales [$i] + $value->Sales; 

在上面的代碼中，沒有爲右側的$totalChannelSales [$i]定義值。你只需要低於Assignement。

$totalChannelSales[$i] = $value->Sales; 

Answer 5

編輯：

我已經介紹了一個臨時變量$ tempsum這將刪除所有不確定的問題。

public function getChannelsSales ($ChannelSales) { 
    $totalChannelSales = array(); 
    $i = 0; 
    foreach ($ChannelSales as $ChSales) { 
     $tempsum = 0; 
     foreach ($ChSales as $value) { 
      $tempsum += $value->Sales; 
     } 
     $totalChannelSales[$i] = $tempsum; 
     $i++; 
    } 
    return $totalChannelSales; 
}