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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: welcome.php");
- exit;
- }
- // Include config file
- require_once "config.php";
- // Define variables and initialize with empty values
- $username = $password = "";
- $username_err = $password_err = "";
- $balance = "";
- // Processing form data when form is submitted
- if($_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
- $sql = "SELECT id, username, password FROM users WHERE username = ?";
- if($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;
- $_SESSION["balance"] = $balance;
- // Redirect user to welcome page
- header("location: welcome.php");
- } else{
- // Display an error message if password is not valid
- $password_err = "The password you entered was not valid.";
- }
- }
- } else{
- // Display an error message if username doesn't exist
- $username_err = "No account found with that username.";
- }
- } else{
- echo "Oops! Something went wrong. Please try again later.";
- }
- }
- // Close statement
- mysqli_stmt_close($stmt);
- }
- // Close connection
- mysqli_close($link);
- }
- ?>
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