PHP, POST And Session Practice

session_start();
$_SESSION['good'] = 1;
?>

name:
password:

-------------------------
post-receive.php

//this must be present to retrieve
//the previous session
session_start();

function check_session()
{
if ($_SESSION['good'] == 2 ){
echo "password is correct";
echo "
";

}
else {
echo "password is not correct\n";
echo "
";
}

}

echo $_POST['name'];
echo "
";
echo $_POST['password'];
echo "
";

if ($_POST['name'] == 'jie' && $_POST['password'] == 'cute'){
$_SESSION['good'] = 2;
}

check_session();

echo "print session good";
echo $_SESSION['good'];
echo "
";
echo "delete the session";
session_destroy();
//or delete the specific session, unset($_SESSION['good']);
echo "
";
?>