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login.php
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login.php
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<?php
$page = "login";
include('header.php');
$_SESSION['timestamp'] = time();
// Check if the user is already logged in, if yes then redirect him to welcome page
if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
header("location: index.php");
exit;
}else{
session_destroy();
}
// Define variables and initialize with empty values
$username = $password = "";
// Processing form data when form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$errors = array();
// Check if username is empty
if (empty(trim($_POST["username"]))) {
array_push($errors, "Please enter username");
} else {
$username = trim($_POST["username"]);
}
// Check if password is empty
if (empty(trim($_POST["passkey"]))) {
array_push($errors, "Please enter your password");
} else {
$password = trim($_POST["passkey"]);
}
// Validate credentials
if (count($errors) == 0) {
// Prepare a select statement
$sql = "SELECT id, username, email ,password, usertype FROM users WHERE status = 'ACTIVE' AND username = ?";
if ($stmt = mysqli_prepare($connection, $sql)) {
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($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, $email, $hashed_password, $usertype);
if (mysqli_stmt_fetch($stmt)) {
if (password_verify($password, $hashed_password)) {
// Password is correct, so start a new session
session_start();
// Store data in session variables
session_regenerate_id();
$_SESSION["loggedin"] = true;
$_SESSION["userid"] = $id;
$_SESSION['username'] = $username;
$_SESSION["designation"] = $usertype;
$_SESSION["email"] = $username;
session_write_close();
// Redirect user to welcome page
if ($stmt->num_rows == 1 && $_SESSION["loggedin"] == True) {
header("location: index.php");
}
} else {
// Display an error message if password is not valid
array_push($errors, "Sorry, you entered an incorrect username or password");
}
}
} else {
// Display an error message if username doesn't exist
array_push($errors, "Sorry, you entered an incorrect username or password");
}
} else {
array_push($errors, "Oops! Something went wrong. Please try again later");
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Close connection
mysqli_close($connection);
}
?>
<?php if (isset($errors)) : ?>
<?php if (count($errors) > 0) : ?>
<?php foreach ($errors as $error) : ?>
<div class="alert alert-danger"><?php echo $error ?></div>
<?php endforeach ?>
<?php endif ?>
<?php endif ?>
<!-- content begins here -->
<div class="container">
<div class="row justify-content-md-center">
<div class="col-md-4">
<div class="card">
<div class="card-header">Login into your account</div>
<div class="card-body">
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group">
<label for="">username</label>
<input type="text" name="username" id="username" class="form-control">
</div>
<div class="form-group">
<label for="">Password</label>
<input type="password" name="passkey" id="passkey" class="form-control">
</div>
<button class="btn btn-danger" type="reset">Reset</button>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</div>
</div>
</div>
</div>
<!-- content ends here -->
<?php
include('footer.php');
?>