<?php require_once 'db.php';
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CREATE TABLE attendance ( id INT PRIMARY KEY, student_id INT, date DATE, status VARCHAR(255) ); ?php require_once 'db.php'
$sql = "SELECT * FROM users WHERE username='$username' AND password='$password'"; $result = $conn->query($sql); status VARCHAR(255) )
<?php require_once '../../config/db.php'; $date = $_POST['date'] ?? date('Y-m-d'); $class_id = $_POST['class_id']; $statuses = $_POST['status']; // array student_id => 'present'|'absent' $pdo->beginTransaction(); $del = $pdo->prepare('DELETE FROM attendance WHERE class_id=? AND date=?'); $del->execute([$class_id, $date]); $ins = $pdo->prepare('INSERT INTO attendance (student_id,class_id,date,status) VALUES (?,?,?,?)'); foreach($statuses as $sid=>$st) $ins->execute([$sid, $class_id, $date, $st]);