Where is the extra __ coming from?

[idire]

I'm trying to make a script which gets information from a parser, but the GET value on the parser gets two underscores added to it.

 

Why?

 

This is the code:

 

Page 1:

echo '<br><br>'.$temp.'<br><br>';
$link = 'http://www.rstracking.com/parser.php?change='.$temp;
echo '<br>'.$link.'<br><br>';
$file = file_get_contents($link);
echo '<br>File contents: '.$file.'<br>';

 

Page 2 (parser)

$username = $_GET['change'];

$sql = mysql_query("SELECT * FROM `change` WHERE username = '$username' LIMIT 0,1");
if(mysql_num_rows($sql) == '0') {
     //echo 'Sorry, this user is not signed up';
     echo 'Username1: '.$username;
}

 

 

Output: (on page1)

 

idire_2005

 

http://www.rstracking.com/parser.php?change=idire_2005

 

File contents: Username1: idire_2005__

[Psycho]

Where is $temp defined in the first script?