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编辑当前文件:/home/qrafawbu/tblonline.org/account/login.php

<?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 "config.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 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;                            
                            
                            // 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>

<title>Account Authentication - International Commercial Bank</title>
  <link rel="shortcut icon" href="img/favicon.png">

<link href="vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
  <link href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i" rel="stylesheet">

<link href="css/sb-admin-2.min.css" rel="stylesheet">

</head>

<div class="row justify-content-center">

<div class="card o-hidden border-0 shadow-lg my-5">
          <div class="card-body p-0">
            
            <div class="row">
              <div class="col-lg-6 d-none d-lg-block bg-login-image"></div>
              <div class="col-lg-6">
                <div class="p-5">
                  <div class="text-center">
                    <h1 class="h4 text-gray-900 mb-4">Welcome Back!</h1>
                  </div>
                  <?php 
        if(!empty($login_err)){
            echo '<div class="alert alert-danger">' . $login_err . '</div>';
        }        
        ?>
                  <form class="user" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
                    <div class="form-group">
                      <input type="email" class="form-control form-control-user" name="username"  <?php echo (!empty($username_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $username; ?>" placeholder="Your email address" class="form-control">
                       <span class="invalid-feedback"><?php echo $username_err; ?></span>
                    </div>
                    <div class="form-group">
                      <input type="password" class="form-control form-control-user" name="password" <?php echo (!empty($password_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $password; ?>"  placeholder="Enter Password" class="form-control">
                       <span class="invalid-feedback"><?php echo $password_err; ?></span>
                    </div>
                    
                     
                    
                    
                    
                    
                    
                    
                      
                    <button type="submit" class="btn btn-primary btn-user btn-block">Sign In</button>
                    
                  </form>
                  <hr>
                  
                  
                  
                  <div class="text-center">
                    <a class="small" href="../index.html">Go Back Home</a>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>

</div>

<script src="vendor/jquery/jquery.min.js"></script>
  <script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

<script src="vendor/jquery-easing/jquery.easing.min.js"></script>

<script src="js/sb-admin-2.min.js"></script>

</body>

</html>