Problem with rand()

hi.....I need to have random 10nums in one string, without spaces or dots.
I tried this:
$delcode = rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9);

but on site that message appeared:

Notice: Undefined variable: delcode in /opt/lampp/htdocs/newsletter/index.php on line 16

here is all my code:

<?php

$title = "Newsletter";

include('../header.php');
include("../functions/mysql_con.php");

$delcode = rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9) . rand(0,9);

function sendmail($to) {
$subject = "[site] - Registrácia do newsletteru";
$message = '
Vážený zákazník,
ďakujeme Vám za registráciu do newsletteru na našej stránke.

Ak sa chcete odhlásiť z newsletteru, kliknite <a href="http://[site].sk/newsletter/odhlasenie/?id='.$delcode.'">sem</a>.';
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=utf-8' . "\r\n";
$headers .= 'From: [site].sk <newsletter@[site].sk>' . "\r\n";
mail($to,$subject,$message,$headers);
}

if ($_POST['send']) {
$old = array("\"", "\'", "<", ">", "(", ")", ";", "ľ", "š", "č", "ť", "ž", "ý", "á", "í", "é", "ň", "ú", "ä", "ô");
$new = array(""", "'", "&lt", "(", ")", ";", "&gt", "ľ", "Å¡", "Ä�", "Å¥", "ž", "ý", "á", "Ã*", "é", "ň", "ú", "ä", "ô");
$email = str_replace($new, $old, $_POST['email']);

if (strcmp($_POST['email'],"")) {

if (mysql_query("INSERT INTO newsletter (mail,del_code) VALUES ('".$email."','".$delcode."')") && sendmail($email))
{
echo '
<div id="content" align="center">

<h2>Úspešne ste sa registrovali do newsletteru</h2>

</div>

<meta http-equiv="refresh" content="2;url=/">
';
}
else {
echo '
<div id="content" align="center">

<h2>Vyskitol sa problém pri registrácii</h2>

<p>Prosím skuste neskôr.</p>

</div>
';
}
}
else {
echo '
<div id="content" align="center">

<h2>Nezadali ste svoj e-mail</h2>

<table>
<form action="/newsletter/index.php" method="post">
<tr><td>Váš e-mail: </td><td><input type="text" name="email" maxlength="350" /></td></tr>
<tr><td colspan="2"><input type="hidden" name="send" value="1" /></td></tr>
<tr><td colspan="2"><input type="submit" value="Prihlásiť sa do newsletteru" /></td></tr>
</form>
</table>

</div>
';
}
}
include("../functions/mysql_close.php");
include('../footer.php'); ?>


where is the problem?

Thanks in advance.

Inside your sendmail function, $delcode is *local* since you haven't declared it global (which it is). So you need to start sendmail like this:

function sendmail($to) { global $delcode; ....


Or you could pass $delcode in as a parameter to sendmail, of course (which would be better).

Dave