Как да интегрирам уникален код в регистрация

IMBA

Registered
Това е файла за регистрация
Код:
<?php
	define('IN_VALID', true);
	include("config.php"); 
	if ($_POST[register]) { 
	$username = $_POST[username]; 
	$password = $_POST[pass]; 
	$cpassword = $_POST[cpass];
 
	if($username==NULL|$password==NULL|$cpassword==NULL) { 
		echo "Празно поле<img src=\"css/images/stop.png\">"; 
	}else{ 
	
	if($password != $cpassword) { 
		echo "Паролите не съвпадат<img src=\"css/images/stop.png\">"; 
	}else{ 
		$password = md5($password); 
		$checkname = mysql_query("SELECT username FROM users WHERE username='$username'"); 
		$checkname= mysql_num_rows($checkname); 

	if ($checkname>0) { 
		echo "Потребителя е зает<img src=\"css/images/stop.png\">"; 
	}else{ 
		$username = htmlspecialchars($username); 
		$password = htmlspecialchars($password); 
		$query = mysql_query("INSERT INTO users (username, password) VALUES('$username','$password')"); 
		echo "Благодаря че се регистрирахте."; } } }
	}else{ 
 		echo ("
				<form method=\"post\">
					<table style=\"width: 300px;\"> 
						<tr>
					<td>Потребител:</td>$code
					<td align=\"center\"><input id=\"field_one\" type=\"text\" size=\"15\" maxlength=\"25\" name=\"username\"></td> 
						</tr><tr>
					<td>Парола:</td> 
					<td align=\"center\"><input id=\"field_two\" type=\"password\" size=\"15\" maxlength=\"25\" name=\"pass\"></td> 
						</tr><tr>
					<td>Повтори парола:</td> 
					<td align=\"center\"><input id=\"field_two\" type=\"password\" size=\"15\" maxlength=\"25\" name=\"cpass\"></td> 
						</tr><tr>");
					include("code.php");
					echo ("<td align=\"center\"><input id=\"field_two\" type=\"text\" size=\"15\" maxlength=\"8\" name=\"code\"></td> 
						</tr><tr>
					<td></td>
					<td align=\"center\"><input id=\"field_two\" name=\"register\" type=\"submit\" value=\"Регистрирай се\"></td>
						</tr>
					</table> 
				</form>"); } 
?>


Как да интегрирам този код вътре.
Код:
<?php
include("config.php");
define(count,8); 
define(simbols,'0123456789');
	$code = substr(str_shuffle(simbols),0,count);
	$continue = false;
	while(!$continue) {
	$zapis = mysql_query("INSERT INTO `codes` (`code`) VALUES ('$code')");
	if($zapis){
		$continue = true;
	} else {
	$code = substr(str_shuffle(simbols),0,count);
	$continue = false; } }
echo ("<td>$code</td>") 
?>
 

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