Inlogscript

index.php:
[code]
<?
session_start();

include ("config.php");

if(!isset($_SESSION['ID']))
{
	if($_SERVER['REQUEST_METHOD'] != 'POST')
	{
		$query = mysql_query("SELECT * FROM gebruikers WHERE naam = '" . $_POST['gebruiker'] . "' AND pass = '" . md5($_POST['pass']) . "'");
		$resultaat = mysql_num_rows($query);

		if(empty($resultaat))
		{
			echo "<script>alert('Foutieve login.'); document.location.href=('index.php')</script>";
		}
		else
		{
			while($rij = mysql_fetch_assoc($query))
			{
				$id = $rij['id'];
			}
				header("location: index.php");
				$_SESSION['ID'] = $id;
		}
	}
	else
	{
		include("errors.php");
?>
<form method="POST">
<input type="hidden" value="1" name="inloggen">
Gebruikersnaam: <input type="text" name="gebruiker" maxlength="15"><br>
Wachtwoord: <input type="password" name="pass"><br><br>

<input type="Submit" value="Login"><br>
<a href="registreer.php">Registreer</a><br>
</form>
<?
}
}
else
{
header('location: home.php');
} ?>[/code]
registreer.php:
[code]<?
error_reporting(E_ALL);

include("config.php");

if($_SERVER['REQUEST_METHOD'] == 'POST')
{
?>
<form method="POST">
<input type="hidden" value="1" name="reg_gebr">
<b>Gebruikersnaam:</b><br>
<input type="text" name="naam" maxlength="20"> (Maximum 20 tekens)<br>

<b>Email:</b><br>
<input type="text" name="email" maxlength="125"><br>

<b>Wachtwoord:</b><br>
<input type="password" name="pass"> (Minimum 5 tekens)<br>

<b>Bevestig wachtwoord:</b><br>
<input type="password" name="pass2"><br><br>

<input type="Submit" value="Registreer">
<input type="button" value="Annuleer" OnClick="history.go(-1)">
</form>
<?
}
else
{
	if(!empty($_POST['naam']) AND !empty($_POST['email']) AND !empty($_POST['pass']) AND !empty($_POST['pass2']))
	{
		$resultaat = mysql_result(mysql_query("SELECT COUNT(1) FROM gebruikers WHERE naam = '" . $_POST['naam'] . "'"),0);
		if(!empty($resultaat))
		{
			echo "<script>alert('Gebruikersnaam is al in gebruik.'); history.go(-1)</script>";
		}
		else
		{
			if(strlen($_POST['pass']) > 4)
			{
				echo "<script>alert('Wachtwoord te kort.'); history.go(-1)</script>";
			}
			else
			{
				if($_POST['pass'] != $_POST['pass2'])
				{
					echo "<script>alert('Wachtwoorden zijn niet hetzelfde.'); history.go(-1)</script>";
				}
				else
				{
					mysql_query("INSERT INTO gebruikers (naam,pass,email) VALUES
					('" . $_POST['naam'] . "','" . $_POST['pass'] . "','" . md5($_POST['pass']) . "')") or die(mysql_error());
					header('location: index.php?error=2');
				}
			}
		}
	}
	else
	{
		echo "<script>alert('Gelieve alles in te vullen'); history.go(-1)</script>";
	}
}
?>
[/code]
config.php:
[code]
<?
$hostname = "..."; //MySQL Hostname
$username = "..."; //MySQL gebruikersnaam
$password = "..."; //MySQL Wachtwoord
$database = "..."; //MySQL Database

mysql_connect($hostname,$username,$password) or die(mysql_error());
mysql_select_db($database);
?>
[/code]
home.php:
[code]
<?
include("config.php");

if(isset($_SESSION['ID'])) {
	//Hier de inhoud...
} else {
	header('location: index.php?error=1');
}
[/code]
errors.php:
[code]
<?
if(isset($_GET['error'])) {
if($_GET['error'] == 0) {
echo "<b><font color=\"green\">Gefeliciteerd. U kunt dit systeem nu gebruiken.</font></b>";
} elseif($_GET['error'] == 1) {
echo "<b><font color=\"red\">U bent niet ingelogd.</font></b>";
} elseif($_GET['error'] == 2) {
<b><font color=\"blue\">U bent succesvol geregistreerd. U kunt nu inloggen.</font></b>";
}
}
[/code]
SQL:
(Met phpMyAdmin):
[code]
CREATE TABLE `login` (
`id` int NOT NULL auto_increment,
`naam` varchar(20) NOT NULL,
`pass` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
[/code]
(Of heb je geen phpMyAdmin?):
[code]
<?
include("config.php");

mysql_query("CREATE TABLE `login` (
`id` int NOT NULL auto_increment,
`naam` varchar(20) NOT NULL,
`pass` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;") or die(mysql_error());
header('location: index.php?error=0'); ?>[/code]