<?php

$username = $_POST['username'];
$email = $_POST['email'];
$location = $_POST['location'];

?>
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="POST">
Username:
  <input type="text" name="username" value="<?php echo $username; ?>"  />
<br>
Email:
<input type="text" name="email" value="<?php echo $email; ?>"  />
<br>
Password:
<input type="password" name="password1" />
<br>
Password(again):
<input type="password" name="password2" />
<br>
Location:
<input type="text" name="location" value="<?php echo $location; ?>"  />
<br />
<?php
$ip=$_SERVER['REMOTE_ADDR'];
?>
Ip: <strong><?php echo "$ip" ?></strong><br />
<br />
<input  name="terms" type="checkbox">
I agree the Terms and Conditions <br />
<br />

<input type="submit" name="submit" value="Register!" />
</form>
<?php
$username = $_POST['username'];
$email = $_POST['email'];
$password1 = $_POST['password1'];
$password2 = $_POST['password2'];
$location = $_POST['location'];
$terms = $_POST['terms'];

$namelength = strlen($username);

if(isset($_POST['username']) && $namelength > 3)
{
  if($password1 != $password2)
  {
  echo "Your passwords do not match!";
  }
  elseif($terms != on)
  {
  echo "You must agree before you can continue!";
  }
}
elseif($namelength <= 3 && $namelength >= 1)
{
echo "Your Username must be longer than 3 characters!";
}
?>