PHP - Organizing Php Scripts In Folders

I have two related websites which utilize the same database:

Currently, I have both located in /var/www/combined-app which is a single git repository and contains the following:

/var/www/combined-app/
    public/
    public-admin/
    src/
        main/
        admin/
    vendor/
    composer.json
    bootstrap.php

Alternatively, I could have done the following:

/var/www/combined-app/
    main/
        public/
        src/
        vendor/
        composer.json
        bootstrap.php
    admin/
        public/
        src/
        vendor/
        composer.json
        bootstrap.php

Or maybe something else all together?

Is one approach typically better than the other?   If so, please provide reasons why.  If my second example, would you recommend separate git repositories for main and admin?

Thanks

So I'm calling in data from a DB where each record is associated with a (column) 'start_time', 'no_shows', 'cancelled', and 'attended' 

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: 

All it does is just organize the data into separate arrays without any counting. Attached is a preview of the output. 

// 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
         )
    ));

Any suggestions or help is greatly appreciated!