If you use CakePHP, then the right way is to use
AuthComponent::loggedIn()<http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#AuthComponent::loggedIn>
To display user name use
$this->Auth->user('username');<http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#AuthComponent::user>
If you use native PHP:
if(!isset($_SESSION['username'])) {
echo "Why you dont register ?";
} else {
echo $_SESSION['username'];
}
or
echo !isset($_SESSION['username']) ? "Why you dont register ?"
: $_SESSION['username'];
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