我有以下MySQL查询和PHP代码，用于将Count结果格式化为单个数组：

$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var_dump($cnt)作为最后一行包括在内）

该var_dump返回以下数组：

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以字符串形式而不是整数形式返回？

应该以整数形式返回吗？还是在处理计数查询时将结果作为字符串返回，这是正常的做法吗？

谢谢。