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register.php
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register.php
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<?php
# Include connection
require_once "./config.php";
# Define variables and initialize with empty values
$username_err = $email_err = $password_err = "";
$username = $email = $password = "";
# Processing form data when form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
# Validate username
if (empty(trim($_POST["username"]))) {
$username_err = "Please enter a username.";
} else {
$username = trim($_POST["username"]);
if (!ctype_alnum(str_replace(array("@", "-", "_"), "", $username))) {
$username_err = "Username can only contain letters, numbers and symbols like '@', '_', or '-'.";
} else {
# Prepare a select statement
$sql = "SELECT id FROM users WHERE username = ?";
if ($stmt = mysqli_prepare($link, $sql)) {
# Bind variables to the statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_username);
# Set parameters
$param_username = $username;
# Execute the prepared statement
if (mysqli_stmt_execute($stmt)) {
# Store result
mysqli_stmt_store_result($stmt);
# Check if username is already registered
if (mysqli_stmt_num_rows($stmt) == 1) {
$username_err = "This username is already registered.";
}
} else {
echo "<script>" . "alert('Oops! Something went wrong. Please try again later.')" . "</script>";
}
# Close statement
mysqli_stmt_close($stmt);
}
}
}
# Validate email
if (empty(trim($_POST["email"]))) {
$email_err = "Please enter an email address";
} else {
$email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$email_err = "Please enter a valid email address.";
} else {
# Prepare a select statement
$sql = "SELECT id FROM users WHERE email = ?";
if ($stmt = mysqli_prepare($link, $sql)) {
# Bind variables to the statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_email);
# Set parameters
$param_email = $email;
# Execute the prepared statement
if (mysqli_stmt_execute($stmt)) {
# Store result
mysqli_stmt_store_result($stmt);
# Check if email is already registered
if (mysqli_stmt_num_rows($stmt) == 1) {
$email_err = "This email is already registered.";
}
} else {
echo "<script>" . "alert('Oops! Something went wrong. Please try again later.');" . "</script>";
}
# Close statement
mysqli_stmt_close($stmt);
}
}
}
# Validate password
if (empty(trim($_POST["password"]))) {
$password_err = "Please enter a password.";
} else {
$password = trim($_POST["password"]);
if (strlen($password) < 8) {
$password_err = "Password must contain at least 8 or more characters.";
}
}
# Check input errors before inserting data into database
if (empty($username_err) && empty($email_err) && empty($password_err)) {
# Prepare an insert statement
$sql = "INSERT INTO users(username, email, password) VALUES (?, ?, ?)";
if ($stmt = mysqli_prepare($link, $sql)) {
# Bind varibales to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "sss", $param_username, $param_email, $param_password);
# Set parameters
$param_username = $username;
$param_email = $email;
$param_password = password_hash($password, PASSWORD_DEFAULT);
# Execute the prepared statement
if (mysqli_stmt_execute($stmt)) {
echo "<script>" . "alert('Registeration completed successfully. Login to continue.');" . "</script>";
echo "<script>" . "window.location.href='./login.php';" . "</script>";
exit;
} else {
echo "<script>" . "alert('Oops! Something went wrong. Please try again later.');" . "</script>";
}
# Close statement
mysqli_stmt_close($stmt);
}
}
# Close connection
mysqli_close($link);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>User login system</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-0evHe/X+R7YkIZDRvuzKMRqM+OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor" crossorigin="anonymous">
<link rel="stylesheet" href="./css/main.css">
<link rel="shortcut icon" href="./img/favicon-16x16.png" type="image/x-icon">
<script defer src="./js/script.js"></script>
</head>
<body>
<div class="container">
<div class="row min-vh-100 justify-content-center align-items-center">
<div class="col-lg-5">
<div class="form-wrap border rounded p-4">
<h1>Sign up</h1>
<p>Please fill this form to register</p>
<!-- form starts here -->
<form action="<?= htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post" novalidate>
<div class="mb-3">
<label for="username" class="form-label">Username</label>
<input type="text" class="form-control" name="username" id="username" value="<?= $username; ?>">
<small class="text-danger"><?= $username_err; ?></small>
</div>
<div class="mb-3">
<label for="email" class="form-label">Email Address</label>
<input type="email" class="form-control" name="email" id="email" value="<?= $email; ?>">
<small class="text-danger"><?= $email_err; ?></small>
</div>
<div class="mb-2">
<label for="password" class="form-label">Password</label>
<input type="password" class="form-control" name="password" id="password" value="<?= $password; ?>">
<small class="text-danger"><?= $password_err; ?></small>
</div>
<div class="mb-3 form-check">
<input type="checkbox" class="form-check-input" id="togglePassword">
<label for="togglePassword" class="form-check-label">Show Password</label>
</div>
<div class="mb-3">
<input type="submit" class="btn btn-primary form-control" name="submit" value="Sign Up">
</div>
<p class="mb-0">Already have an account ? <a href="./login.php">Log In</a></p>
</form>
<!-- form ends here -->
</div>
</div>
</div>
</div>
</body>
</html>