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<?php

if(isset($_POST['submit']))
{
    $name = mysql_real_escape_string($_POST['name']);
    $username = mysql_real_escape_string($_POST['username']);
    $password = mysql_real_escape_string($_POST['password']);
    $password1 = mysql_real_escape_string($_POST['password1']);

    $enc_password = md5($password);

    if($name && $username && $password && $password1)
    {
        if(strlen($name)<30)
        {
            if(strlen($username)<10)
            {
                if(strlen($password)<30 || strlen($password)>6)
                {
                    if($password == $password1)
                    {
                        require "dbc.php";
                        $query = mysql_query("INSERT INTO users VALUES ('','$name','$username','$enc_password')");
                        echo "Registration Complete! <a href='loginpage.php'>Click here to login</a>";
                    }
                    else
                    {
                        echo "Passwords must match";
                    }
                }
                else
                {
                    echo "Your password must be between 6 and 30 characters";
                }
            }
            else
            {
                echo "Your username is too long";
            }
        }
        else
        {
            echo "Your name is too long";
        }
    }
    else
    {
        echo "All fields are required";
    }
}

?>

<html>

    <form action="register.php" method="POST">
        Name: <input type="text" name="name" value="<?php if(isset($_POST['submit'])){echo "$name";} ?>"> Max Length:30<p>
        Username: <input type="text" name="username" value="<?php if(isset($_POST['submit'])){ echo "$username";} ?>"> Max Length:15<p>
        Password: <input type="password" name="password"> Max length:30<p>
        Re-Enter Password: <input type="password" name="password1"><p>
        <input type="submit" name="submit" value="Register">
    </form>

</html>

if($name && $username && $password && $password1)

if(empty($name) && empty($username) && empty($password) && empty($password1))