Here is my html form and my php code. It is supposed to check if any of the forms have not been filled and echo a message if they have not. Then process the registration if they have. But it seems to ignore the blank spots. If I don't fill in fields it just processes the blank registration anyways. Where did I go wrong?
<?php
include ('config.php');
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string(md5($_POST['password']));
$firstname = mysql_real_escape_string($_POST['firstname']);
$lastname = mysql_real_escape_string($_POST['lastname']);
$email = mysql_real_escape_string($_POST['email']);
if (!isset($username) || !isset($password) || !isset($firstname) || !isset($lastname) || !isset($email) ) {
echo "You did not fill out the required fields.";
} else {
$query = mysql_query("SELECT * FROM users WHERE username = '$username'");
$rows = mysql_num_rows($query);
if ($rows > 0) {
die("Username taken!");
} else {
$user_input = mysql_query("INSERT INTO users (username, password, firstname, lastname, email) VALUES ('$username','$password','$firstname','$lastname','$email')");
echo("Succesfuly Registered!");
}
}
}
?>
<html>
<head>
<title>Register</title>
</head>
<body>
<form action="register.php" method="post">
First Name: <input type="text" name="firstname"><br/>
Last Name: <input type="text" name="lastname" /><br/>
Email: <input type="text" name="email" /><br/>
Username: <input type="text" name="username" /><br/>
Password: <input type="password" name="password"/><br/>
<input type="submit" value="Register!"/>
</form>
</body>
</html>