How to get value from repeatedly calling function with different parameters in php

Question

This is my result, but this is not my expectation

Name : YOUR_NAME
Lesson : Algorithm and Programming
Total duration : 3
Room : A17
Lecturer : Ikhsan Permadi
Day : Monday, Thursday
Building : South Block

Name : YOUR_NAME
Lesson : Data Structure 2
Total duration : 2
Room : B10
Lecturer : Faisal Sulhan
Day : Wednesday
Building : North Block

Name : YOUR_NAME
Lesson : Data Structure 2
Total duration : 2
Room : B10
Lecturer : Faisal Sulhan
Day : Wednesday
Building : North Block

I can't create an array value in a class, how can I do that, this is my expected output

// Output
// ================================================

// Name: YOUR_NAME
// Lesson: Algorithm and Programming
// Total duration: 3 SKS
// Room: A17
// Lecturer: Ikhsan Permadi
// Day: Monday, Thursday
// Building: South Block


// Name: YOUR_NAME
// Lesson: Artificial Intelligence, Data Structure 2
// Total duration: 5 SKS
// Room: B12, B10
// Lecturer: Ikhsan Permadi, Faisal Sulhan
// Day: Thursday, Wednesday
// Building: North Block


// Name: YOUR_NAME
// Lesson: Algorithm and Programming, Advanced Database, Artificial Intelligence, Data Structure 2
// Total duration: 12 SKS
// Room: A17, B12, B10
// Lecturer: Ikhsan Permadi, Faisal Sulhan
// Day: Monday, Thursday, Tuesday, Wednesday
// Building: South Block, North Block

$student = new Student;
$student->takeLesson('Algorithm and Programming');

$student->getLessonSummary();

$student = new Student;
$student->takeLesson('Artificial Intelligence');
$student->takeLesson('Data Structure 2');

$student->getLessonSummary();

$student = new Student;
$student->takeLesson('Algorithm and Programming');
$student->takeLesson('Advanced Database');
$student->takeLesson('Artificial Intelligence');
$student->takeLesson('Data Structure 2');

$student->getLessonSummary();

class Lesson
{   
    public function getDetail($lessonName)
    {
        $details = [
            [
                'name' => 'Algorithm and Programming',
                'lecturer' => 'Ikhsan Permadi',
                'room' => 'A17',
                'schedule' => [
                    [
                        'day'=> 'Monday',
                        'duration'=> '2 SKS'
                    ],
                    [
                        'day'=> 'Thursday',
                        'duration'=> '1 SKS'
                    ]
                ]
            ],
            [
                'name' => 'Advanced Database',
                'lecturer' => 'Faisal Sulhan',
                'room' => 'B12',
                'schedule' => [
                    [
                        'day'=> 'Tuesday',
                        'duration'=> '2 SKS'
                    ],
                    [
                        'day'=> 'Thursday',
                        'duration'=> '2 SKS'
                    ]
                ]
            ],
            [
                'name' => 'Artificial Intelligence',
                'lecturer' => 'Ikhsan Permadi',
                'room' => 'B12',
                'schedule' => [
                    [
                        'day'=> 'Thursday',
                        'duration'=> '3 SKS'
                    ]
                ]
            ],
            [
                'name' => 'Data Structure 2',
                'lecturer' => 'Faisal Sulhan',
                'room' => 'B10',
                'schedule' => [
                    [
                        'day'=> 'Wednesday',
                        'duration'=> '2 SKS'
                    ]
                ]
            ],
        ];
        foreach ($details as $key => $detail) {
            if ($detail['name'] == $lessonName) {
                return $details[$key];
            }
        }
    }
}

class Room
{
    public function getBuilding($roomName)
    {
        $details = [
            'A17' => 'South Block',
            'B12' => 'North Block',
            'B10' => 'North Block'
        ];

        // sleep(2);

        return $details[$roomName];
    }
}

   
class Student
{
    public function takeLesson($lessonName)
    {   
        $lesson = new Lesson;
        $lesson = $lesson->getDetail($lessonName);

        
        $dataLesson = $lesson['name'];        
        
       
        $totalDuration = array();
        $days = array();
        foreach($lesson['schedule'] as $schedule){
            $totalDuration[] = $schedule['duration'];
            $days[] = $schedule['day'];
        }

        $day = implode(", ", $days);

        $totalDuration = array_sum($totalDuration);

        $building = new Room;
        $building = $building->getBuilding($lesson['room']);
       
        $this->data = [
            "Name" => "YOUR_NAME",
            "Lesson" => $dataLesson,
            "Total duration"=> $totalDuration,
            "Room" => $lesson['room'],
            "Lecturer" => $lesson['lecturer'],
            "Day" => $day,
            "Building" => $building           
            ];
        
    }

    public function getLessonSummary()
    {
        $data = $this->data;
        list() = multiple();

        foreach ($data as $key => $value) {
            if("array" == gettype($value)){
                $value= json_encode($value);
            }
            echo "$key : $value\n";
            echo '<br>';
        }      
        echo '<br>';
        

    }
}

Answer 1

The problem is with your student class.

Each time you call takeLesson you are overwriting the data property

So it can be solved by using an array to store them like this

class Student
{
    private $data = [];

    public function takeLesson($lessonName)
    {   
        $lesson = new Lesson;
        $lesson = $lesson->getDetail($lessonName);

        
        $dataLesson = $lesson['name'];        
        
       
        $totalDuration = array();
        $days = array();
        foreach($lesson['schedule'] as $schedule){
            $totalDuration[] = $schedule['duration'];
            $days[] = $schedule['day'];
        }

        $day = implode(", ", $days);

        $totalDuration = array_sum($totalDuration);

        $building = new Room;
        $building = $building->getBuilding($lesson['room']);
       
        $this->data[] = [
            "Name" => "YOUR_NAME",
            "Lesson" => $dataLesson,
            "Total duration"=> $totalDuration,
            "Room" => $lesson['room'],
            "Lecturer" => $lesson['lecturer'],
            "Day" => $day,
            "Building" => $building           
            ];
        
    }

    public function getLessonSummary()
    {
        $dataArray = $this->data;
        list() = multiple();

        foreach($dataArray as $data) {
            foreach ($data as $key => $value) {
                if("array" == gettype($value)){
                    $value= json_encode($value);
                }
                echo "$key : $value\n";
                echo '
';
            }      
            echo '
';
        }
    }
}