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path: root/register.php
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<?php include_once 'header.php';?>

<section>
	<h2>Register an account</h2>
	<form action="register.php" method="post">
		<label for="user_name">Username: </label><br>
		<input type="text" name="user_name"><br>
		<label for="user_pass">Password: </label><br>
		<input type="password" name="user_pass"><br>
		<label for="user_pass_check">Re-enter password: </label><br>
		<input type="password" name="user_pass_check"><br>
		<input type="submit" name="submit">
	</form>

<?php
include_once 'includes/db_inc.php';

function validate($data)  {
	$data = trim($data);
	$data = stripslashes($data);
	$data = htmlspecialchars($data);
	return $data;
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	$errors = array();

	$user_name = "";
	$user_pass = "";

	if (empty($_POST['user_name'])) {
		$errors[] = "You must provide a username.";
	} else {
		$user_name = validate($_POST['user_name']);
		if (strlen($user_name) > 30) {
			$errors[] = "Your username must be 30 characters or less.";
		}
	}

	if (empty($_POST['user_pass'])) {
		$errors[] = "You must provide a password.";
	} else {
		$user_pass = validate($_POST['user_pass']);
		$pass_check = validate($_POST['user_pass_check']);
		if ($user_pass !== $pass_check) {
			$errors[] = "The two passwords do not match.";
		}
	}

	if (!empty($errors)) {
		echo 'Please check the following problems: <ul>';
		foreach ($errors as $err) {
			echo '<li>' . $err . '</li>';
		}
		echo '</ul>';
	} else {
		$sql = "INSERT INTO users(user_name, user_pass, user_date) VALUES(?, ?, NOW());";
		$stmt = mysqli_stmt_init($dbc);

		if (!mysqli_stmt_prepare($stmt, $sql)) {
			die('Could not create account due to internal error: ' . mysqli_error($dbc));
		}

		$pass_hash = password_hash($user_pass, PASSWORD_DEFAULT);

		mysqli_stmt_bind_param($stmt, "ss", $user_name, $pass_hash);
		mysqli_stmt_execute($stmt);
		mysqli_stmt_close($stmt);

		echo 'Account successfully registered! You can now <a href="signin.php">sign in</a>';
	}
}
?>

</section>

<?php include_once 'footer.php';?>