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Notice: Undefined index

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Hello everybody,

its seems to be that one of my script files wont work like it should be anymore, Can somebody help me around with this error;

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Notice: Undefined index: username in C:\WebServer\htdocs\ricardox\user_check.php on line 10[/quote]

The code is;

[code]$user = $_COOKIE['username'];
$sql = mysql_query("SELECT * FROM users WHERE username = '$user'");  // This is line 10
$row = mysql_fetch_array($sql);
$num = mysql_num_rows($sql);[/code]

What is the problem right now on this code? Thanks for your solution if you have one!

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Undefined index means the the key/index of the array that you are trying to read is not set. $_COOKIE['username'] doesn't exist.

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