我正在尝试了解如何使用PHP和MySQL构建用户注册。这是我创建的表单和我编写的一些PHP代码。由于我的注册，我有两种类型的用户（卖方和买方）。我想知道如何为两者进行注册。我已经给出了我想要创建的数据库属性名称。
代码：
<?php
include('dbconnection.php');
ob_start();
if(isset($_POST['submit']) == true)
{
$fullname = mysql_real_escape_string($_POST['fullname']);
$email = mysql_real_escape_string($_POST['emailadd']);
$contact = mysql_real_escape_string($_POST['contactno']);
$pass = md5(mysql_real_escape_string($_POST['pass']));
$cpass = md5(mysql_real_escape_string($_POST['cpass']));
$usertype = mysql_real_escape_string($_POST['usertype']);
$tc = mysql_real_escape_string($_POST['tc']);
$result_email = mysqli_query($conn, "SELECT * FROM foodbox WHERE mem_email='$memail'");
?>
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags always come first -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="description" content="">
<meta name="author" content="">
<title>Foodbox</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
<!-- Custom CSS -->
<link rel="stylesheet" href="css/header_footer.css">
</head>
<body>
<nav class="navbar navbar-default" style="background-color: #f9dc79;">
<div class="container-fluid">
<div class="navbar-header" >
<a class="navbar-brand" href="index.html"><img src="img/foodboxlogo1.png" height="38px;" style="position:relative; bottom:7px;"></a>
<a class="navbar-brand" href="#">Foodbox</a>
</div>
<ul class="nav navbar-nav" >
<li><a href="#">Home</a></li>
<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Order by<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Restaurants</a></li>
<li><a href="#">Meals</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
</div>
</nav>
<!-- container -->
<div class="container">
<div class="row">
<!-- Article main content -->
<article class="col-xs-12 maincontent">
<header class="page-header">
<h1 class="page-title">Registration</h1>
</header>
<div class="col-md-6 col-md-offset-3 col-sm-8 col-sm-offset-2">
<div class="panel panel-default">
<div class="panel-body">
<h3 class="thin text-center">Register a new account</h3>
<p class="text-center text-muted">Existing User?<a href="signin.html">Login</a> to get more info </p>
<hr>
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
<div class="top-margin">
<label>Full Name</label>
<input type="text" name="fullname" class="form-control">
</div>
<span style="color:red"><?php echo (isset($name_error) ? "*" . $name_error : "") ?></span>
<div class="top-margin">
<label>Email Address <span class="text-danger">*</span></label>
<input type="email" name="emailadd" class="form-control">
</div>
<div class="top-margin">
<label>Contact No <span class="text-danger">*</span></label>
<input type="text" name="contactno" class="form-control">
</div>
<div class="row top-margin">
<div class="col-sm-6">
<label>Password <span class="text-danger">*</span></label>
<input type="password" name="pass" class="form-control">
</div>
<div class="col-sm-6">
<label>Confirm Password <span class="text-danger">*</span></label>
<input type="password" name="cpass" class="form-control">
</div>
</div>
<span style="color:red"><?php echo (isset($pass_error) ? "*" . $pass_error : "") ?></span>
<div class="row">
<div class="col-lg-6 text-left" style="position:relative; right:-20px;">
<label class="radio" >
<input type="radio" name="usertype" value="caterer">
<h5>Register as Caterer</h5>
</label>
</div>
<div class="col-lg-6">
<label class="radio">
<input type="radio" name="usertype" value="customer">
<h5>Register as Customer</h5>
</label>
</div>
</div>
<hr>
<div class="row">
<div class="col-lg-7 text-left" style="position:relative; right:-20px;">
<label class="checkbox">
<input type="checkbox" name="tc">
I've read the <a href="page_terms.html">Terms and Conditions</a>
</label>
</div>
<div class="col-lg-5 text-right">
<button class="btn btn-action" type="submit" name="submit">Register</button>
</div>
</div>
</form>
</div>
</div>
</div>
</article>
<!-- /Article -->
</div>
</div> <!-- /container -->
<footer id="footer-main">
<div class="container">
<div class="row">
<div class="col-sm-4">
<h3>Available Payment</h3>
<p>You can pay through Cash on Delivery or online using your Credit Cards</p>
<div class="form-inline">
<img src="img/cashon.png" alt="A wet spiderweb" height="50px;">
<img src="img/visa.png" alt="A wet spiderweb" height="50px;">
<img src="img/mastercard.png" alt="A wet spiderweb" height="50px;">
</div>
</div>
<div class="col-sm-4 " >
<h3>Get Touch With Us</h3>
<p>Follow us and get in touch with Talabat latest events. </p>
<div class="form-inline">
<a href=""><img src="img/facebook.png" alt="A wet spiderweb" height="50px;"></a>
<a href=""><img src="img/twitter.png" alt="A wet spiderweb" height="50px;"></a>
<a href=""><img src="img/linked.png" alt="A wet spiderweb" height="50px;"></a>
<a href=""><img src="img/insta.png" alt="A wet spiderweb" height="50px;"></a>
<a href=""><img src="img/youtube.png" alt="A wet spiderweb" height="50px;"></a>
</div>
</div>
<div class="col-sm-4 " >
<h3>Contact</h3>
<div>
<h5>+234 23 9873237<br>
<a href="mailto:#">foodbox_delivery@gmail.com</a><br>
<br>
777 Taman Agenda, Negeri Sembilan 77777
</h5>
<a href="#" class="btn btn-default btn-xs" role="button">Privacy & Policy</a>
<a href="#" class="btn btn-default btn-xs" role="button">Term & Condition</a>
</div>
</div>
</div>
</footer>
<!-- jQuery first, then Bootstrap JS. -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="bootstrap/js/bootstrap.min.js"></script>
</body>
</html>