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login.php
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login.php
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<?php
// Initialize the session
session_start();
// Check if the user is already logged in, if yes then redirect him to welcome page
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){
header("location: index.php");
exit;
}
// Include config file
require_once "core/db.php";
// Define variables and initialize with empty values
$username = $password = "";
$username_err = $password_err = $login_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Check if username is empty
if(empty(trim($_POST["username"]))){
$username_err = "Please enter username.";
} else{
$username = trim($_POST["username"]);
}
// Check if password is empty
if(empty(trim($_POST["password"]))){
$password_err = "Please enter your password.";
} else{
$password = trim($_POST["password"]);
}
// Validate credentials
if(empty($username_err) && empty($password_err)){
// Prepare a select statement
$sql = "SELECT uid, uname, upass FROM users WHERE uname = ?";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_username);
// Set parameters
$param_username = $username;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Store result
mysqli_stmt_store_result($stmt);
// Check if username exists, if yes then verify password
if(mysqli_stmt_num_rows($stmt) == 1){
// Bind result variables
mysqli_stmt_bind_result($stmt, $id, $username, $hashed_password);
if(mysqli_stmt_fetch($stmt)){
if(password_verify($password, $hashed_password)){
// Password is correct, so start a new session
session_start();
// Store data in session variables
$_SESSION["loggedin"] = true;
$_SESSION["id"] = $id;
$_SESSION["username"] = $username;
// Redirect user to welcome page
header("location: index.php");
} else{
// Password is not valid, display a generic error message
$login_err = "Invalid username or password.";
}
}
} else{
// Username doesn't exist, display a generic error message
$login_err = "Invalid username or password.";
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
// Close statement
mysqli_stmt_close($stmt);
}
}
// Close connection
mysqli_close($link);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-0evHe/X+R7YkIZDRvuzKMRqM+OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-pprn3073KE6tl6bjs2QrFaJGz5/SUsLqktiwsUTF55Jfv3qYSDhgCecCxMW52nD2" crossorigin="anonymous"></script>
<title>Login - LMS</title>
</head>
<body>
<section class="h-100">
<div class="container h-100">
<div class="row justify-content-sm-center h-100">
<div class="col-xxl-4 col-xl-5 col-lg-5 col-md-7 col-sm-9">
<div class="text-center my-5">
<img src="https://getbootstrap.com/docs/5.0/assets/brand/bootstrap-logo.svg" alt="logo" width="100">
</div>
<div class="card shadow-lg">
<div class="card-body p-5">
<h1 class="fs-4 card-title fw-bold mb-4 text-center">Login</h1>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="POST" class="needs-validation" novalidate="" autocomplete="off">
<?php
if(!empty($login_err)){
echo '<div class="alert alert-danger p-2">' . $login_err . '</div>';
}
?>
<div class="mb-3">
<label class="mb-2 text-muted" for="username">Username</label>
<input id="username" type="text" class="form-control" name="username" value="" required autofocus>
<div class="invalid-feedback">
Username is invalid
</div>
</div>
<div class="mb-3">
<div class="mb-2 w-100">
<label class="text-muted" for="password">Password</label>
</div>
<input id="password" type="password" class="form-control" name="password" required>
<div class="invalid-feedback">
Password is required
</div>
</div>
<div class="d-flex align-items-center pb-3">
<div class="form-check">
<input type="checkbox" name="remember" id="remember" class="form-check-input">
<label for="remember" class="form-check-label">Remember Me</label>
</div>
</div>
<div class="mb-3">
<button type="submit" class="btn btn-primary w-100">
Login
</button>
</div>
</form>
</div>
</div>
<div class="text-center mt-5 text-muted">
Copyright © 2017-2021 — YSK Soft
</div>
</div>
</div>
</div>
</section>
<script src="js/login.js"></script>
</body>
</html>