PHP注册表 - 上传图像并以表格形式编号

Question

我想制作一个注册表格，我可以附加图像并在订阅结束时写入（数字或日期）

这是我的代码

    if (isset($_POST['username'])){
 $username = $_POST['username'];
 $email = $_POST['email'];
 $password = $_POST['password'];
 $username = stripslashes($username);
 $username = mysql_real_escape_string($username);
 $email = stripslashes($email);
 $email = mysql_real_escape_string($email);
 $password = stripslashes($password);
 $password = mysql_real_escape_string($password);
 $trn_date = date("Y-m-d H:i:s");
 $expira = $_Post[''];
 $query = "INSERT into `users` (username, password, email, trn_date,expira) VALUES ('$username', '".md5($password)."', '$email', '$trn_date', '$expira')";
 $result = mysql_query($query);
 if($result){
 echo "<div class='form'><h3>You are registered successfully.</h3><br/>Click here to <a href='login.php'>Login</a></div>";
 }
 }else{
?>

这是提交表格

    <form name="registration" action="" method="post">
<input type="text" name="username" placeholder="Username" required />
<input type="email" name="email" placeholder="Email" required />
<input type="text" name="expira" placeholder="Data de Expirare al cardului" required />
<input type="password" name="password" placeholder="Password" required />
<input type="submit" name="submit" value="Register" />
</form>

$ expira = $ _Post ['']是订阅结束的日期。它也在输入中。

但是对于图像我没有做任何事情，因为我没有找到任何教程。