Register RS-SC

<?php
if ($Config["Regopen"] != 0)	{
	if (isset($_POST['sendForm']))	{

		$username = $_POST['username'];
		$password = $_POST['password'];
		$cpassword = $_POST['cpassword'];

		$encryptPassword = sha1($password);

		if (!empty($username) && (!empty($password)))	{
			if ($password == $cpassword)	{

				if (strlen($username) < $strLongUser)	{
					if (strlen($password) < $strLongPass)	{
						$fetchUsername = "SELECT * FROM useraccounts WHERE username = '$username'";
						if ($stmt = $conn->prepare($fetchUsername))	{
							$stmt->execute();
							$stmt->store_result();
							if ($stmt->num_rows == 0)	{
								$stmt->close();
								if ($stmt = $conn->prepare("INSERT INTO useraccounts (username, password) VALUES (?, ?)"))	{
									$stmt->bind_param('ss', $username, $encryptPassword);

									$rUser = $_POST['username'];
									$rPass = $_POST['password'];

									$stmt->execute();
									echo '<div class="alert alert-success"><i class="fa fa-check"></i> You have succesfully registered, '.$rUser.'.</div>';
								} else {
									printf("Prepared Statement Error: %s\n", $conn->error);
								}
							} else {
								echo '<div class="alert alert-danger"><i class="fa fa-times"></i> This username was already taken.</div>';
							}
						}
					} else {
						echo '<div class="alert alert-danger"><i class="fa fa-times"></i> The password may consist out of a maximum of 20 characters.</div>';
					}
				} else {
					echo '<div class="alert alert-danger"><i class="fa fa-times"></i> The username may consist out of a maximum of 16 characters.</div>';
				}

			} else {
				echo '<div class="alert alert-danger"><i class="fa fa-times"></i> Please make sure the passwords are equal.</div>';
			}
		} else {
			echo '<div class="alert alert-danger"><i class="fa fa-times"></i> Error: Please fill in your username and password.</i></div>';
		}
	}
} else {
	echo '<div class="alert alert-warning"><i class="fa fa-times"></i> Sorry, but registration has been disabled.</div>';
}
?>