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Notice: Undefined index: C adı: \ wamp \ www \ espn.com \ registration.php hattında 12

Notice: Undefined index: C adı: \ wamp \ www \ espn.com \ registration.php hat 13

Notice: Undefined index: password in C:\wamp\www\espn.com\registration.php on line 14 I'm sorry but the username you specified has already been taken. Please pick another one.

kodlama

<html>
<body>
<?php
$dbhost = "localhost";
$dbname = "users";
$dbuser = "root";
$dbpass = "*******";

mysql_connect ($dbhost,$dbuser,$dbpass)or die("Could not connect: ".mysql_error());
mysql_select_db($dbname) or die(mysql_error());

$name = $_POST['name'];
$username = $_POST['username'];
$password = md5($_POST['password']);

$checkuser = mysql_query("SELECT username FROM users WHERE username='$username'"); 

$username_exist = mysql_num_rows($checkuser);

if($username_exist > 1){
    echo "I'm sorry but the username you specified has already been taken.  Please pick another one.";
    unset($username);
    include 'registration.html';
    exit();
}

$query = "INSERT INTO users (name,username, password)
VALUES('$name','$username', '$password')";
mysql_query($query) or die(mysql_error());
mysql_close();

echo "You have successfully registered";
?>
</body>
</html>

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