PHP的MySQL計數查詢結果是字符串，而不是整數

Question

我有以下MySQL查詢，和PHP代碼在單個陣列中格式化Count結果：

$equalDimensions_query = 
"SELECT 'allEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images 
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images 
) AS union_table 
WHERE primaryId = $imgId AND imgWidth = $maxImageWidth AND imgHeight = $maxImageHeight 
UNION ALL 
SELECT 'widthEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images 
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images 
) AS union_table 
WHERE primaryId = $imgId AND imgWidth = $maxImageWidth AND imgHeight != $maxImageHeight 
UNION ALL 
SELECT 'heightEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images 
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images 
) AS union_table 
WHERE primaryId = $imgId AND imgWidth != $maxImageWidth AND imgHeight = $maxImageHeight"; 

$equalDimensions_data = mysql_query($equalDimensions_query) or die('MySql Error' . mysql_error()); 

while ($row = mysql_fetch_assoc($equalDimensions_data)) { 
    $cnt[$row['COL1']] = $row['imgCount']; 
} 

var_dump($cnt); 

（注意我包括var_dump($cnt)作爲最後線）

的var_dump返回以下的數組：

array 
(
    'allEqual' => string '2' (length=1) 
    'widthEqual' => string '0' (length=1) 
    'heightEqual' => string '0' (length=1) 
) 

我很好奇爲什麼計數被返回爲一個字符串，而不是一個整數？

它應該作爲整數返回嗎？或者，在處理count查詢時是否是標準，結果是以字符串形式返回的？

謝謝。

Answer 1

從http://www.php.net/manual/en/function.mysql-fetch-assoc.php：

如果沒有更多的行，則返回字符串的關聯數組對應於 提取的行，或FALSE。

（強調我的）這對於MySQL驅動程序來說可能更容易讓所有的東西都作爲一個字符串，並且假設你會知道如何處理它。只需使用intval（）即可獲得整數值。

Answer 2

無論是列值還是函數的結果（返回值的類型也不起作用），所有內容都返回爲字符串¹，無論它是列值（列的類型不會起任何作用）。至少在談論MySql驅動程序時，