Implementation Guide for Student QR Code Seat Selection Feature in PHP

Introduction: This feature allows students to select seats by scanning a QR code without logging in, while teachers can view seat selections and bind courses to record attendance, improving user experience and increasing total users.

Preparation: Create a classroom_time table for each classroom's time slots (e.g., 11 slots per day); create a seattable table to store row, column, student_id and classroom_time_id; design a webpage to display the seat map; generate QR codes that encode classroom ID and seat coordinates.

Implementation steps:

1. Parse the QR‑code URL to obtain classroom_id, row, column and the current time slot; retrieve the corresponding Classroom_time record and the student's existing Seattable record.

2. If a Seattable record exists, check whether the target seat is already occupied. If the seat belongs to the same student, return an error indicating duplicate scanning; otherwise clear the previous occupant's row/column (set to 100,100) and assign the seat to the current student.

3. If the student has no prior record, create a new Seattable entry with the seat coordinates and student ID. When the related Classroom_time status is 1, increment the student's attendance count in the Score table (creating the record if necessary).

4. Daily scheduled jobs should purge all Seattable data and reset Classroom_time status to 0 and clear course associations.

Code snippets (excerpt):

public function entercourse()
{
    $id = $this->request->param('id');
    $classroom_id = substr($id,0,4)*1;
    $row = substr($id,4,2)*1;
    $column = substr($id,6,2)*1;
    $time = Term::littleClass();
    if ($time<=0 || $time>11) {
        return $this->error('上课时间已结束', url('/index/student/page'));
    }
    $student_id = session('studentId');
    $classroom_time = Classroom_time::where('classroom_id',$classroom_id)
        ->where('littleclass',$time)->find();
    $seattable = Seattable::where('student_id',$student_id)
        ->where('classroom_time_id',$classroom_time->id)->find();
    // ... (logic omitted for brevity)
    return $this->success('选座成功', url('/index/student/page'));
}

Conclusion: Planning the workflow before coding helps avoid bugs and security loopholes.