Code controle (Opgelost)

<?
function MaakCode($lengte=10) { 
   ## De tekens die voorkomen in de sleutel 
   $tekens = array('1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'); 
   $code = ''; 

   for($i = 1; $i <= $lengte; $i++) 
      $code .= $tekens[rand(0,10)]; 

   return strtoupper($code); 
}
$code = MaakCode();

if(isset($_POST['Submit'])){
    if(empty($_POST['code'])){ 
        echo "Geen code opgegeven"; 
		echo "<br><br><a href='javascript:history.back(1);'>Terug</a>"; 
    }
	elseif($_POST['code'] != $code){ 
        echo "Code is niet goed !"; 
		echo "<br><br><a href='javascript:history.back(1);'>Terug</a>"; 
    } 
    else { 
       echo"Code is goed !";
} 
}
else {
	echo "<form method=post> 
<table width=267 height=27> 
<tr>     
      <td width=90 height=21></td> 
        <td width=165 height=21>$code</td> 
    </tr>
    <tr>     
      <td width=90 height=21>Code:</td> 
        <td width=165 height=21><input name=code type=text></td> 
    </tr>
	<tr> 
        <td width=90 height=21></td> 
        <td width=165 height=21> <input type=submit value='controleer' name=Submit ></td> 
    </tr> 
</table> 
</form>";
	}
?>

<?
function MaakCode($lengte=10) { 
   ## De tekens die voorkomen in de sleutel 
   $tekens = array('1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'); 
   $code = ''; 
 
   for($i = 1; $i <= $lengte; $i++) 
      $code .= $tekens[rand(0,10)]; 
 
   return strtoupper($code); 
}
$code = MaakCode();
 
if(isset($_POST['Submit'])){
    if(empty($_POST['code'])){ 
        echo "Geen code opgegeven"; 
		echo "<br><br><a href='javascript:history.back(1);'>Terug</a>"; 
    }
	elseif($_POST['code'] != $code){ 
        echo "Code is niet goed !"; 
		echo "<br><br><a href='javascript:history.back(1);'>Terug</a>"; 
    } 
    else { 
       echo"Code is goed !";
} 
}
else {
	echo "<form method=post> 
<table width=267 height=27> 
<tr>     
      <td width=90 height=21></td> 
        <td width=165 height=21>$code</td> 
    </tr>
    <tr>     
      <td width=90 height=21>Code:</td> 
        <td width=165 height=21><input name=code type=text></td> 
    </tr>
	<tr> 
        <td width=90 height=21></td> 
        <td width=165 height=21> <input type=submit value='controleer' name=Submit ></td> 
    </tr> 
</table> 
</form>";
	}
?>