Login Script (PhP) met gebruikersnaam en ww uit een MySql (Opgelost)

<?php
if (!session_is_registered('loginid') || !session_is_registered('username'))
{
	// user is not logged in.
    if (isset($_POST['cmdlogin']))
    {
        // retrieve the username and password sent from login form
        // First we remove all HTML-tags and PHP-tags
        // This step will make sure the script is not vurnable to sql injections.
        $u = strip_tags($_POST['username']);
        $p = strip_tags($_POST['password']);
        //Now let us look for the user in the database.
        $query = sprintf("SELECT loginid FROM login WHERE username = '%s' AND password = '%s' LIMIT 1;",
            mysql_real_escape_string($u), mysql_real_escape_string($p));
        $result = mysql_query($query);
        // If the database returns a 0 as result we know the login information is incorrect.
        // If the database returns a 1 as result we know  the login was correct and we proceed.
        // If the database returns a result > 1 there are multple users
        // with the same username and password, so the login will fail.
        if (mysql_num_rows($result) != 1)
        {
            // invalid login information
            echo "Verkeerde lidcode of logincode ingevoerd!<br><br>";
	    echo "Gegevens vergeten? Neem even contact op met de webmaster.";
            //show the loginform again.
            include "loginform.php";
        } else {
            // Login was successfull
            $row = mysql_fetch_array($result);
            // Save the user ID for use later
            $_SESSION['loginid'] = $row['loginid'];
              // Save the username for use later
            $_SESSION['username'] = $u;
              // Now we show the userbox
            show_userbox();

              
        }
    } else {
    	 // User is not logged in and has not pressed the login button
    	 // so we show him the loginform
        include "loginform.php";
    }
 
} else {
 	// The user is already loggedin, so we show the userbox.
    	show_userbox();

	 
}
?>

<?php
if (!session_is_registered('loginid') || !session_is_registered('username'))
{
	// user is not logged in.
    if (isset($_POST['cmdlogin']))
    {
        // retrieve the username and password sent from login form
        // First we remove all HTML-tags and PHP-tags
        // This step will make sure the script is not vurnable to sql injections.
        $u = strip_tags($_POST['username']);
        $p = strip_tags($_POST['password']);
        //Now let us look for the user in the database.
        $query = sprintf("SELECT loginid FROM login WHERE username = '%s' AND password = '%s' LIMIT 1;",
            mysql_real_escape_string($u), mysql_real_escape_string($p));
        $result = mysql_query($query);
        // If the database returns a 0 as result we know the login information is incorrect.
        // If the database returns a 1 as result we know  the login was correct and we proceed.
        // If the database returns a result > 1 there are multple users
        // with the same username and password, so the login will fail.
        if (mysql_num_rows($result) != 1)
        {
            // invalid login information
            echo "Verkeerde lidcode of logincode ingevoerd!<br><br>";
	    echo "Gegevens vergeten? Neem even contact op met de webmaster.";
            //show the loginform again.
            include "loginform.php";
        } else {
            // Login was successfull
            $row = mysql_fetch_array($result);
            // Save the user ID for use later
            $_SESSION['loginid'] = $row['loginid'];
              // Save the username for use later
            $_SESSION['username'] = $u;
              // Now we show the userbox
            show_userbox();
 
 
        }
    } else {
    	 // User is not logged in and has not pressed the login button
    	 // so we show him the loginform
        include "loginform.php";
    }
 
} else {
 	// The user is already loggedin, so we show the userbox.
    	show_userbox();
 
 
}
?>

<?php 
// Start a session
session_start();
require_once ('db_connect.inc.php');
require_once ("functions.inc.php");
reguire_once ("login.php")
?>

<?php 
// Start a session
session_start();
require_once ('db_connect.inc.php');
require_once ("functions.inc.php");
reguire_once ("login.php")
?>

<?php
if(isset($_SESSION['loginid']) && isset($_SESSION['username'])) { 
  // ja, gebruiker is ingelogd
}
else { 
  // je moet inloggen!
}
?>

<?php
if(isset($_SESSION['loginid']) && isset($_SESSION['username'])) { 
  // ja, gebruiker is ingelogd
}
else { 
  // je moet inloggen!
}
?>

<?phpif(isset($_SESSION['loginid']) && isset($_SESSION['username'])) {   // ja, gebruiker is ingelogd}
else {   // je moet inloggen!}?>

<?phpif(isset($_SESSION['loginid']) && isset($_SESSION['username'])) {   // ja, gebruiker is ingelogd}
else {   // je moet inloggen!}?>

<?php
if(isset($_SESSION['loginid']) && isset($_SESSION['username'])) { 
  echo 'ja, gebruiker is ingelogd';
}
else { 
  echo 'je moet inloggen!';
}
?>

<?php
if(isset($_SESSION['loginid']) && isset($_SESSION['username'])) { 
  echo 'ja, gebruiker is ingelogd';
}
else { 
  echo 'je moet inloggen!';
}
?>