The following needs to be on a basic web page using the PHP request-response model to create a log-in form that permits the user to request access to an administration console for a Web-based product catalog of your choosing. Server-side scripting will authenticate the user based on valid users found in a text file verified by the server.
Once a user logs on to the administration console, he or she will need a form that will allow an authenticated user to add, edit, and delete products, product categories, and suppliers from the Web-based product catalog.
config.php:
<?php
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', root');
define('DB_NAME', 'root');
$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
if($link === false){
die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>
login.php:
<?php
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";
$username = $password = "";
$username_err = $password_err = "";
if($_SERVER["REQUEST_METHOD"] == "POST"){
if(empty(trim($_POST["username"]))){
$username_err = "Please enter username.";
} else{
$username = trim($_POST["username"]);
}
if(empty(trim($_POST["password"]))){
$password_err = "Please enter your password.";
} else{
$password = trim($_POST["password"]);
}
if(empty($username_err) && empty($password_err)){
// Prepare a sql statement
$sql = "SELECT id, username, password FROM users WHERE username = ?";
if($stmt = mysqli_prepare($link, $sql)){
mysqli_stmt_bind_param($stmt, "s", $param_username);
$param_username = $username;
if(mysqli_stmt_execute($stmt)){
mysqli_stmt_store_result($stmt);
// Check if username exists, if yes then verify password
if(mysqli_stmt_num_rows($stmt) == 1){
mysqli_stmt_bind_result($stmt, $id, $username, $hashed_password);
if(mysqli_stmt_fetch($stmt)){
if(password_verify($password, $hashed_password)){
session_start();
$_SESSION["loggedin"] = true;
$_SESSION["id"] = $id;
$_SESSION["username"] = $username;
header("location: welcome.php");
} else{
$password_err = "The password you entered was not valid.";
}
}
} else{
$username_err = "Wrong user name";
}
} else{
echo "Oops!try again later";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Close connection
mysqli_close($link);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
body{ font: 14px sans-serif; }
.wrapper{ width: 350px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
<h2>Login</h2>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
<label>Username</label>
<input type="text" name="username" class="form-control" value="<?php echo $username; ?>">
<span class="help-block"><?php echo $username_err; ?></span>
</div>
<div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
<label>Password</label>
<input type="password" name="password" class="form-control">
<span class="help-block"><?php echo $password_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Login">
</div>
</form>
</div>
</body>
</html>
<?php
// Initialize the session
session_start();
// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
header("location: login.php");
exit;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Welcome</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
body{ font: 14px sans-serif; text-align: center; }
</style>
</head>
<body>
<div class="page-header">
<h1>Hi, <b><?php echo htmlspecialchars($_SESSION["username"]); ?></b>. Welcome to our site.</h1>
</div>
<p>
<a href="reset-password.php" class="btn btn-warning">Reset Your Password</a>
<a href="logout.php" class="btn btn-danger">Sign Out of Your Account</a>
</p>
</body>
</html>
welcome.php:
<?php
session_start();
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
header("location: login.php");
exit;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Welcome</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
body{ font: 14px sans-serif; text-align: center; }
</style>
</head>
<body>
<div class="page-header">
<h1>Hi, <b><?php echo htmlspecialchars($_SESSION["username"]); ?></b>. Welcome to our site.</h1>
</div>
<a href="add.php">Add the product</a>
<a href="edit.php">Edit the product</a>
<p>
<a href="logout.php" class="btn btn-danger">Sign Out of Your Account</a>
</p>
</body>
</html>
add.php:
<?php
// Include config file
require_once "config.php";
// Define variables and initialize with empty values
$name = $type = "";
$name_err = $type_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate name
if(empty(trim($_POST["name"]))){
$name_err = "Please enter a name.";
} else{
// Prepare a select statement
$sql = "SELECT id FROM users WHERE name = ?";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_name);
// Set parameters
$param_name = trim($_POST["name"]);
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
/* store result */
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt) == 1){
$name_err = "This name is already taken.";
} else{
$name = trim($_POST["name"]);
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Validate type
if(empty(trim($_POST["type"]))){
$type_err = "Please enter a type.";
} else{
$type = trim($_POST["type"]);
}
}
// Check input errors before inserting in database
if(empty($name_err) && empty($type_err) ){
// Prepare an insert statement
$sql = "INSERT INTO users (name, type) VALUES (?, ?)";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ss", $param_name, $param_type);
// Set parameters
$param_name = $name;
$param_type = $type;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Redirect to welcome page
header("location: welcome.php");
} else{
echo "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">
<title>Sign Up</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
body{ font: 14px sans-serif; }
.wrapper{ width: 350px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
<h2>Sign Up</h2>
<p>Please fill this form to create an account.</p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group <?php echo (!empty($name_err)) ? 'has-error' : ''; ?>">
<label>Username</label>
<input type="text" name="name" class="form-control" value="<?php echo $name; ?>">
<span class="help-block"><?php echo $name_err; ?></span>
</div>
<div class="form-group <?php echo (!empty($type_err)) ? 'has-error' : ''; ?>">
<label>Password</label>
<input type="type" name="type" class="form-control" value="<?php echo $type; ?>">
<span class="help-block"><?php echo $type_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit">
</div>
</form>
</div>
</body>
</html>
logout.php:
<?php
// Initialize the session
session_start();
// Unset all of the session variables
$_SESSION = array();
// Destroy the session.
session_destroy();
// Redirect to login page
header("location: login.php");
exit;
?>
The following needs to be on a basic web page using the PHP request-response model to...