PHP的MySQL计数查询结果是字符串，而不是整数

Question

我有以下MySQL查询，和PHP代码在单个阵列中格式化Count结果：

$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)作为最后线）

的var_dump返回以下的数组：

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

我很好奇为什么计数被返回为一个字符串，而不是一个整数？

它应该作为整数返回吗？或者，在处理count查询时是否是标准，结果是以字符串形式返回的？

谢谢。

Answer 1

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

如果没有更多的行，则返回字符串的关联数组对应于 提取的行，或FALSE。

（强调我的）这对于MySQL驱动程序来说可能更容易让所有的东西都作为一个字符串，并且假设你会知道如何处理它。只需使用intval（）即可获得整数值。

Answer 2

无论是列值还是函数的结果（返回值的类型也不起作用），所有内容都返回为字符串¹，无论它是列值（列的类型不会起任何作用）。至少在谈论MySql驱动程序时，