PHP: foreach loop by id and month and add values - php

Question

I've been trying to solve this issue I'm currently having. We have a table with id, productid, userid, count and downloaddate. Something like below to understand the structure and what the results look like.
+----+-----------+--------+-------+---------------+
| id | productid | userid | count | downloaddate |
+----+-----------+--------+-------+---------------+
| 1 | 9 | 231 | 2 | October 2017 |
| 2 | 8 | 230 | 1 | October 2017 |
| 3 | 9 | 287 | 1 | October 2017 |
| 4 | 9 | 200 | 2 | November 2017 |
+----+-----------+--------+-------+---------------+
So what I want to loop is to get all the productid and return the total number of count for the given month which is recorded in the downloaddate column.
To return this:
+------------+-------+---------------+
| productid | count | downloaddate |
+------------+-------+---------------+
| 9 | 3 | October 2017 |
| 8 | 1 | October 2017 |
| 9 | 2 | November 2017 |
+------------+-------+---------------+
Is it possible to do this? I've tried this but it's returning the total count for the productid
$sum = array();
$emparray = array();
foreach ($downloads as $download){
$emparray[] = $download;
}
foreach ($emparray as $downloaded){
if (!isset($sum[$downloaded->id])) {
$sum[$downloaded->id]['count'] = $downloaded->count;
$sum[$downloaded->id]['downloaddate'] = $downloaded->downloaddate;
} else {
$sum[$downloaded->id]['count'] += $downloaded->count;
$sum[$downloaded->id]['downloaddate'] = $downloaded->downloaddate;
}
}
Any help will be appreciated!
EDIT
This is my sql query:
$downloads = $wpdb->get_results(
"
SELECT ast.*, dl.userid, dl.count, dl.downloaddate
FROM $lead_table as ast
JOIN $table_downloads as dl ON (dl.productid = ast.id)
"
);

Answer 1

You can get the result by one query grouping by productid and downloaddate (I hope that October2017 is a typo in the question)
SELECT productid, sum(count) as count, downloaddate
FROM your_table
GROUP BY productid, downloaddate
update. with your query it seems to be
SELECT ast.*, dl.userid, sum(dl.count) as count, dl.downloaddate
FROM $lead_table as ast
JOIN $table_downloads as dl
ON (dl.productid = ast.id)
GROUP BY dl.userid, dl.downloaddate

Answer 2

i think you should edit your sql Query into this :
SELECT productid, sum(count) as count, downloaddate FROM your_table GROUP BY downloaddate

Answer 3

You have to be able to tell which month is given in the downloaddate (can you build a timestamp ? Or something else that tells you that "October2017" is the same that "October 2017".
Once you got that, you "just" have to store your "sum" in a 2D array with something like that:
$sum = array();
foreach ($downloads as $download) {
// dateToTimeStamp: custom function who gives you the same number for October2017 or October 2017
$timestamp = dateToTimeStamp($downloaded->downloaddate);
if (!isset($sum[$timestamp])) {
$sum[$timestamp] = [];
}
if (!isset($sum[$timestamp][$downloaded->id])) {
$sum[$timestamp][$downloaded->id]['count'] = $downloaded->count;
$sum[$timestamp][$downloaded->id]['downloaddate'] = $downloaded->downloaddate;
continue 1;
}
$sum[$timestamp][$downloaded->id]['count'] += $downloaded->count;
$sum[$timestamp][$downloaded->id]['downloaddate'] = $downloaded->downloaddate;
}

Answer 4

you can easily use this query and extract the data from php and use it there
select productid,sum(count),downloaddate from tablename group by productid,downloaddate