This one working.... i copy pasted that input codes and the $_GET code.
still help me find the error in the previous code

php.flashwebhost.com/austin/day7exp.php

<?php

if ($_GET['full_name']>0) {
echo 'i got the name';
echo 'Hi '.$_GET['full_name'].' Whats up buddy!';
}

else{

echo'
<html>
<body>
<p> welcome to my website! </P>';

echo'Whats you name?';

echo'<form method="GET" action="day7exp.php">
Enter Your Name: <input name="full_name" type="number">

<button type="submit">Go</botton>
</form>
</body>
</html>';
}