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student.php
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<?php
session_start();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Student Log-in</title>
</head>
<body>
<header class="head">
<nav class="head__nav">
<ul class="list"><a href="#" class="nav_a">Home</a></ul>
<ul class="list"><a href="admin.php" class="nav_a">Admin Log-in</a></ul>
</nav></header>
<hr>
<h1>Student log-in</h1>
<main class="main">
<div class="section">
<form action="student.php" method="post">
<table>
<tr><td><label for="rollnum" class="label">Roll number</label> </td><td><input type="text" id="rollnum" name="rollnum"><br></td></tr>
<tr><td><label for="password" class="label">Password</label></td><td><input type="password" id="password" name="password"><br></td></tr>
<tr><td><label for="branch" class="label">Branch</label></td><td>
<select name="branch" id="branch" class="select">
<option value="cse">CSE</option>
<option value="ece">ECE</option>
<option value="eee">EEE</option>
<option value="mec">MEC</option>
<option value="civil">CIVIL</option>
<option value="it">IT</option>
<option value="ecm">ECM</option>
</select></td></tr>
<tr><td><label for="year" class="label">Year</label></td><td>
<select name="year" id="year" class="select">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select></td></tr>
<tr><td><label for="sem" class="label">Semester</label></td><td>
<select name="sem" id="sem" class="select">
<option value="1">1</option>
<option value="2">2</option>
</select></td></tr></table>
<div class="sub">
<input type="submit" value="login" name="login" class="btn">
</div>
</form>
</div>
</main>
<footer class="foot"></footer>
</body>
</html>
<?php
require("db_connect.php");
if($_SERVER["REQUEST_METHOD"] == "POST"){
if(empty($_POST["rollnum"]) || empty($_POST["password"])){
echo"please enter all details";
}
else{
$sql="SELECT * FROM student_details WHERE rollnum ='{$_POST["rollnum"]}'";
$result=mysqli_query($con,$sql);
// if(mysqli_num_rows($result)==0)echo"user doesn't exist";
if(mysqli_num_rows($result)==1){
$row=mysqli_fetch_assoc($result);
if($row["submit"]==true) die("you have already submitted the feedback");
if($row["password"]!=$_POST["password"])echo"you have entered wrong details";
elseif($row["branch"]!=$_POST["branch"])echo"you have entered wrong details";
elseif($row["year"]!=$_POST["year"])echo"you have entered wrong details";
elseif($row["sem"]!=$_POST["sem"])echo"you have entered wrong details";
else{
$_SESSION["rollnum"]=$_POST["rollnum"];
$_SESSION["year"]=$_POST["year"];
$_SESSION["branch"]=$_POST["branch"];
$_SESSION["sem"]=$_POST["sem"];
header("Location: main.php");
}
}
else{
echo"user doesn't exist";
}
}
}
?>