Question

I have the following MySQL query, and PHP code to format the Count result in a single array:

$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);

(Notice I included var_dump($cnt) as the last line)

The var_dump returned the following array:

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

I’m curious why the count is being returned as a string, and not as an integer?

Should it be returned as an integer? Or is it the norm when dealing with count queries, for the result to be returned as a string?

Thanks.

Answer 1

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

Returns an associative array of strings that corresponds to the
fetched row, or FALSE if there are no more rows.

(emphasis mine) It’s probably just easier for the MySQL driver to give you everything as a string, and assume you will know what to do with it. Just use intval() to get the integer value.