<?php
if(
    isset( $_POST['user'] ) &&
    isset( $_POST['pass'] )
)
{
    if( strlen( $_POST['user'] ) < 4 )
    {
        echo "Username Must Be More Than 4 Characters.";
    }
    elseif( strlen( $_POST['pass'] ) < 4 )
    {
        echo "Passwrod Must Be More Than 4 Characters.";
    }
    elseif( $_POST['pass'] == $_POST['user'] )
    {
        echo"Username And Password Can Not Be The Same.";
    }
    else
    {
        include( 'database.php' );

        $username = mysql_real_escape_string( $_POST['user'] );
        $password = md5( $_POST['pass'] );

        $sqlCheckForDuplicate = "SELECT username FROM user WHERE username = '". $username ."'";


        if( mysql_num_rows( mysql_query( $sqlCheckForDuplicate ) ) == 1 )
        {
            $sqlRegUser =     "INSERT INTO
                        user( username, password )
                    VALUES(
                        '". $username ."',
                        '". $password ."'
                        )";

            if( !mysql_query( $sqlRegUser ) )
            {
                echo "You Could Not Register Because Of An Unexpected Error.";
            }
            else
            {
                echo "You Are Registered And Can Now Login";
                $formUsername = $username;

                header ('location: Login.php');
            }
        }
        else
        {
            echo "The Username You Have Chosen Is Already Being Used By Another User. Please Try Another One.";
            $formUsername = $username;
        }
    }
}
else
{
    echo "You Could Not Be Registered Because Of Missing Data.";
}
?>