!empty(trim($_POST['username']
Ok the problem is that when i use the trim function doesnt work but when i run the code without the trim function its working, but not properly working(the form accepts whitespaces) <?php session_start(); unset($_SESSION['username']); if (isset($_SESSION['username'])) {echo "You are in already";} else if ($_SERVER['REQUEST_METHOD'] == 'POST') { if (!empty(trim($_POST['username'])) && !empty(trim($_POST['email']))) { $uname = htmlentities($_POST['username']); $email = htmlentities($_POST['email']); $_SESSION['username'] = $uname; echo "THANKS: " . $uname . "<br />"; } else { echo "fill the