Week array met lessen erin

static public function getWeekLessons(){
        $current_week_number = date('W');
        $current_year = date('Y');
    
        $selected_week_number = (int) $_POST['currentWeekNumber'];
    
        if (isset($_POST['prevOrNext'])) {
            if ($_POST['prevOrNext'] == "prev" && !($selected_week_number <= $current_week_number)) {
                $selected_week_number--; // Move to the previous week
            } elseif ($_POST['prevOrNext'] == "next" && $selected_week_number < 52) {
                $selected_week_number++; // Move to the next week, assuming 52 weeks in a year
            }
        }
    
        $first_day_of_week = new DateTime();
        $first_day_of_week->setISODate($current_year, $selected_week_number);
    
        $weekdays = array();
        for ($i = 0; $i < 7; $i++) {
            $date = $first_day_of_week->format('d-m-Y');
            $weekdays[$date] = [ 
                'date' => $date,
                'lessons' => [] 
            ];
            $first_day_of_week->modify('+1 day');
        }
    
        $firstDayOfWeekFormatted = reset($weekdays)['date'];
        $lastDayOfWeekFormatted = end($weekdays)['date'];
        
        $firstDayOfWeekFormatted = (new DateTime($firstDayOfWeekFormatted))->format('d-m');
        $lastDayOfWeekFormatted = (new DateTime($lastDayOfWeekFormatted))->format('d-m');

        $client = new SportivityClient(13361);
        $lessons = $client->getLocationLessons([])['LessonObjects'];
        foreach ($lessons as $lesson) {
            $startTime = DateTime::createFromFormat('d/m/Y H:i:s', $lesson['StartTime']);
            $lessonDate = $startTime->format('d-m-Y');
        
            if (!isset($weekdays[$lessonDate])) continue;
            $lesson['LessonDate'] = $lessonDate;
            $lesson['StartTimeConverted'] = $startTime->format('H:i');
    
            $endTime = DateTime::createFromFormat('d/m/Y H:i:s', $lesson['EndTime']);
            $lesson['EndTimeConverted'] = $endTime->format('H:i');

            $interval = $endTime->diff($startTime);
            $minutes = $interval->format('%i') + $interval->format('%h') * 60;
            $lesson['Duration'] = $minutes;
            
            $weekdays[$lessonDate]['lessons'][] = $lesson;
        }
    
        wp_send_json([
            'selectedWeekNumber' => $selected_week_number,
            'weekdays' => array_values($weekdays),
            'firstDayOfWeek' => $firstDayOfWeekFormatted,
            'lastDayOfWeek' => $lastDayOfWeekFormatted,
        ]);
    }