# Teacher Bulk Student Upload Feature

## Overview
This feature allows teachers to upload multiple students to their assigned classes using a CSV file. It's designed specifically for teachers and restricts them to only upload students to classes they are associated with.

## Key Features
- CSV-based bulk upload of students
- Automatic user account creation for each student
- Error checking and validation
- Real-time upload results
- Teacher role-based access control

## Implementation Files
1. `bulk_upload_students.php` - Main upload interface
2. `student_upload_template.csv` - CSV template file
3. `bulk_upload_guide.md` - Bengali user guide
4. Updated navigation in existing teacher files

## How It Works

### Access Points
Teachers can access the bulk upload feature from:
1. Dashboard quick actions
2. "My Students" page
3. "Add Student" page
4. Direct navigation to `bulk_upload_students.php`

### Process Flow
1. Teacher downloads the CSV template
2. Teacher fills in student data in the CSV file
3. Teacher uploads the CSV file
4. System validates data and checks permissions
5. System creates student records and user accounts
6. System displays results with login credentials

### Security Features
- Teachers can only upload students to their assigned classes
- Data validation prevents duplicate roll numbers
- All database operations are transactional (all-or-nothing)
- Proper error handling and rollback on failures

## CSV Format
The template includes the following columns:
- First Name (required)
- Last Name (required)
- Father Name
- Mother Name
- Email
- Phone
- Date of Birth
- Gender
- Address
- Guardian Name
- Guardian Phone
- Guardian Email
- Guardian Address
- Class ID (required, must be one of teacher's assigned classes)
- Roll Number (required)
- Admission Date
- Session (required)
- Group Name

## Technical Details
- Uses UTF-8 encoding for Bengali text support
- Implements proper database transactions
- Provides detailed error reporting
- Generates unique student IDs automatically
- Creates user accounts with auto-generated passwords

## Future Enhancements
- Excel file support
- Progress bar for large uploads
- Background processing
- Email notifications
- Upload history and reports