<?php

    $firstname = false;
    $firstnameError = false;
    $lastname = false;
    $lastnameError = false;
    $email = false;
    $emailError = false;
    $usernameError = false;
    $username = false;
    $passwordError = false;
    $repeatpasswordError = false;
    $gender = false;
    $genderError = false;
    $bdayError = false;
    $bday_month = false;
    $bday_day = false;
    $bday_year = false;

if(isset($_POST['submit']))
{
    $connect = mysql_connect("localhost","root","");
    mysql_select_db("phplogin");

    $date = date ("Y-m-d");
    $firstname = strip_tags(mysql_real_escape_string($_POST['firstname']));
    $lastname = strip_tags(mysql_real_escape_string($_POST ['lastname']));
    $email = strip_tags ($_POST ['email']);
    $username = strtolower(strip_tags($_POST ['username']));
    $password = strip_tags($_POST ['password']);
    $repeatpassword = strip_tags($_POST ['repeatpassword']);
    $gender = strip_tags($_POST ['gender']);
    $bday_month = strip_tags ($_POST ['month']);
    $bday_day = strip_tags ($_POST ['day']);
    $bday_year = strip_tags ($_POST ['year']);

    if(empty($firstname)) $firstnameError = "Please enter a First Name.<br>";
    else if(strlen($firstname) > 15) $firstnameError.= "Max limit for First Name is 15 charachters.<br>";

    if(empty($lastname)) $lastnameError = "Please enter a Last Name.<br>";
    else if(strlen($lastname) > 20) $lastnameError.= "Max limit for Last Name is 20 charachters.<br>";

    if(empty($email)) $emailError = "Please enter an Email Address.";
    else if(!preg_match("/^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z-]+\.)+[a-zA-Z]{2,6}$/i", $email)) $emailError = "Email Address is not valid";

    if(empty($username)) $usernameError = "Please enter a Username.";
    elseif(strlen($username) > 12 || strlen($username) < 3) $usernameError = "Username must be between 3 and 12 characters.";

    if(empty($password)) $passwordError = "Please enter a Password.";
    else if(strlen($password) > 12 || strlen($password) < 6) $passwordError = "Password must be between 6 and 12 characters.";

    if(empty($repeatpassword)) $repeatpasswordError = "Please re-enter a Password.";
    else if($repeatpassword != $password) $repeatpasswordError = "Your passwords do not match!";

    if(empty($bday_month)) $bdayError = "Please choose a Birthday.";

    if(empty($bday_day)) $bdayError = "Please choose a Birthday.";

    if(empty($bday_year)) $bdayError = "Please choose a Birthday.";
    else if($bday_year < 3) $bdayError = "Minimum age is 3.";

    if(empty($gender)) $genderError = "Please choose a Gender.";
    else if($gender == 1) $gender = "Male";
    else if($gender == 2) $gender = "Female";

    if(!isset($firstnameError) && !isset($lastnameError) && !isset($emailError) && !isset($usernameError) && !isset($passwordError) && !isset($repeatpasswordError) && !isset($genderError) && !isset($bdayError)) {

        $namecheck = mysql_query("SELECT `username` FROM `users` WHERE 'username' = '{$username}'");
        $count = mysql_num_rows($namecheck);

        if($count) $usernameError = "Username is already taken.";
        else {

            $bday = strtotime($bday_month."/".$bday_day."/".$bday_year);
            $password = md5($password);
            $sql = "INSERT INTO `users` VALUES ('','$date','$firstname','$lastname','$username','$password','$email', '$gender', '$bday')";
            if(mysql_query($sql) or die(mysql_error()))
            die("You have been registtered!");
        }
    }
}

?>