stack1

<?php
$reg = @$_POST['reg'];
//declaring variables to prevent errors
$fn = ""; //First Name
$ln = ""; //Last Name
$un = ""; //Username
$em = ""; //Email
$em2 = ""; //Email 2
$pswd = ""; //Password
$pswd2 = ""; // Password 2
$d = ""; // Sign up Date
$u_check = ""; // Check if username exists
//registration form
$fn = strip_tags(@$_POST['fname']);
$ln = strip_tags(@$_POST['lname']);
$un = strip_tags(@$_POST['uname']);
$em = strip_tags(@$_POST['email']);
$em2 = strip_tags(@$_POST['email2']);
$pswd = strip_tags(@$_POST['password']);
$pswd2 = strip_tags(@$_POST['password2']);
$d = date("Y-m-d"); // Year - Month - Day

if ($reg) {
if ($em==$em2) {
// Check if user already exists

//create a database connection here :
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "giveyourdatabasenamehere";

// Create new database connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection

$sql = "SELECT username FROM users WHERE username='$un'";

$u_check = mysqli_query($conn, $sql);
// Count the amount of rows where username = $un
$check = mysqli_num_rows($u_check);
//Check whether Email already exists in the database
$query2="SELECT email FROM users WHERE email='$em'";
$e_check = mysqli_query($con,$query2);
//Count the number of rows returned
$email_check = mysqli_num_rows($e_check);
if ($check == 0) {
  if ($email_check == 0) {
//check all of the fields have been filed in
if ($fn&&$ln&&$un&&$em&&$em2&&$pswd&&$pswd2) {
// check that passwords match
if ($pswd==$pswd2) {
// check the maximum length of username/first name/last name does not exceed 25 characters
if (strlen($un)>25||strlen($fn)>25||strlen($ln)>25) {
echo "The maximum limit for username/first name/last name is 25 characters!";
}
else
{
// check the maximum length of password does not exceed 25 characters and is not less than 5 characters
if (strlen($pswd)>30||strlen($pswd)<5) {
echo "Your password must be between 5 and 30 characters long!";
}
else
{
//encrypt password and password 2 using md5 before sending to database
$pswd = md5($pswd);
$pswd2 = md5($pswd2);
$query = mysqli_query($conn,"INSERT INTO users VALUES ('','$un','$fn','$ln','$em','$pswd','$d','0','Write something about yourself.','','','no')");
die("<h2>Welcome to the HoogleyBoogley Network</h2>Login to your account to get started ...");
}
}
}
else {
echo "Your passwords don't match!";
}
}
else
{
echo "Please fill in all of the fields";
}
}
else
{
 echo "Sorry, but it looks like someone has already used that email!";
}
}
else
{
echo "Username already taken ...";
}
}
else {
echo "Your E-mails don't match!";
}
}
?>