Split date range into weeks and sum columns based on the week - php

Question

So I'm calling in data from a DB where each record is associated with a (column) 'start_time', 'no_shows and 'cancelled'. Successful attendance is based on whether 'no_shows' && 'cancelled' == 0.
I want to go through the results of this SELECT and count the number of no shows, cancellations and attended on a WEEKLY basis (based on the start_time). How can I achieve this?
The user will provide a date range and the DB will select the records based on that date range. Now this date range will then have to be split by weeks and then get the count. I'm totally stuck on the counting by weeks part. This is what I have so far:
// Multidimensional Array with [boolean][week #]
$no_shows_weekly = [
'no_show' => [],
'week' => []
];
$cancelled_weekly = [
'cancelled' => [],
'week' => []
];
$attended_weekly = [
'attended' => [],
'week' => []
];
foreach($result as $r) {
$start_time = new DateTime($r['start_time']);
if($r['is_no_show'] == 0 && $r['is_cancelled'] == 0) {
array_push($attended_weekly['attended'], 1);
array_push($attended_weekly['week'], date_format($start_time, "W"));
}
else {
array_push($attended_weekly['attended'], 0);
array_push($attended_weekly['week'], date_format($start_time, "W"));
}
array_push($no_shows_weekly['no_show'], $r['is_no_show']);
array_push($no_shows_weekly['week'], date_format($start_time, "W"));
array_push($cancelled_weekly['cancelled'], $r['is_cancelled']);
array_push($cancelled_weekly['week'], date_format($start_time, "W"));
}
echo json_encode(array(
'success'=> 1,
'msg'=>
array(
'No Shows' => $no_shows_weekly,
'Cancellations' => $cancelled_weekly,
'Attendend' => $attended_weekly
)
));
I wasn't able to do any counting in this, rather I just pulled the data and separated into arrays with the corresponding week.
I want to pull data into something like this:
Week 50: {No_Shows: 10, Cancelled: 5, Attended: 25}
Week 52: {No_Shows: 10, Cancelled: 5, Attended: 25}
General DB Structure:
+------------+-----------+-----------+
| start_time | no_shows | cancelled |
+------------+-----------+-----------+
| 2019-12-20 | 1 | 0 |
| 2019-12-21 | 0 | 0 |
| 2019-12-22 | 0 | 1 |
I tried to do this in MySQL as well:
SELECT
WEEKOFYEAR('start_time') AS weekno,
SUM('is_no_show' = 1) AS no_shows,
SUM('is_cancelled' = 1) AS cancelled
FROM
myTable
WHERE
(
`start_time` > '2019-12-01' AND `start_time` < '2019-12-07'
) AND category LIKE 'Continued Probation'
GROUP BY
weekno
However, this statement is returning Null for me. Any suggestions is appreciated! Thank you