Problème avec mon code php

<?php
if(isset($_POST['settings'])) {
	if(empty($_POST['sitename']) ||  empty($_POST['siteurl']) || empty($_POST['slogan']) || empty($_POST['pagination']) || empty($_POST['password'])) {
		echo 'Sorry, one or more fields was left empty.';
	} else {
		if(!ctype_digit($_POST['pagination'])) {
			echo 'Sorry, pagination MUST be a number';
		} else {
			if(!is_writable('../app/tmp')) {
				echo 'Désolé, le répertoire app/tmp doit avoir la permission 777.';
			} else {
			
			include('../app/config/database.php');
			
			// Create settings table
				$query = mysql_query("CREATE TABLE `settings` (`id` int(11) NOT NULL auto_increment, `sitename` varchar(255) NOT NULL default '', `siteurl` varchar(255) NOT NULL default '', `slogan` text NOT NULL, `pagination` int(11) NOT NULL default '0', `password` varchar(255) NOT NULL default '', PRIMARY KEY  (`id`))") or die(mysql_error());
				echo 'Settings table created!<br />';
				// Dump setting data posted from form
				mysql_query("INSERT INTO `settings` VALUES(1, '{$_POST['sitename']}', '{$_POST['siteurl']}', '{$_POST['slogan']}', '{$_POST['pagination']}', '" . md5($_POST['password']) . "')") or die(mysql_error());
				echo 'Settings inserted into table.<br /><br />';

				// Create comments table
				mysql_query("CREATE TABLE `comments` (`id` int(11) NOT NULL auto_increment, `gameid` int(11) NOT NULL default '0', `ipaddress` varchar(255) NOT NULL default '', `comment` text NOT NULL, `name` varchar(255) NOT NULL default '', PRIMARY KEY  (`id`))") or die(mysql_error());
				echo 'Comments table created!<br /><br />';
				
				//Create ad table
				mysql_query("CREATE TABLE `ads` (

  `header_ad` text NOT NULL,
  `sidebar_ad` text NOT NULL,
  `game_ad` text NOT NULL
)") or die(mysql_error());


				// dump ad data
				mysql_query("INSERT INTO `ads` VALUES('header_ad code', 'sidebar_ad code', 'game_ad code')");
			
				// Create links table
				mysql_query("CREATE TABLE `links` (`id` int(11) NOT NULL auto_increment, `sitetitle` varchar(255) NOT NULL default '', `siteurl` varchar(255) NOT NULL default '', `approved` char(3) NOT NULL default '', `email` varchar(255) NOT NULL default '', `name` varchar(255) NOT NULL default '', PRIMARY KEY  (`id`))") or die(mysql_error());
				echo 'Links table created!<br /><br />';
				
			
				// Create rating table
				mysql_query("CREATE TABLE `ratings` (`id` int(11) NOT NULL auto_increment, `gameid` int(11) NOT NULL default '0', `ipaddress` varchar(255) NOT NULL default '', `rating` int(11) NOT NULL default '0', PRIMARY KEY  (`id`))") or die(mysql_error());
				echo 'Rating table created!<br /><br />';
				
				
				//Create ad table
				mysql_query("CREATE TABLE `ads` (

  `header_ad` text NOT NULL,
  `sidebar_ad` text NOT NULL,
  `game_ad` text NOT NULL
)") or die(mysql_error());


				// dump ad data
				mysql_query("INSERT INTO `ads` VALUES('header_ad code', 'sidebar_ad code', 'game_ad code')");

				echo 'Ads table created!<br /><br />';
				
				
			}
		}
	}
} elseif(isset($_GET['settings'])) {
	echo '<form name="settings" method="post" action="install_script.php">

	Nom du site:<br />
	<input type="text" name="sitename" /><br />
	Site URL:<br />
	<input type="text" name="siteurl" /><br />
	Site Slogan:<br />
	<input type="text" name="slogan" /><br />
	Non d\'utilisateur

	<input type="text" name="username" /><br/>
	Mot de passe admin:<br />
	<input type="password" name="password" /><br />
	Adresse E-mail
	<input type="text" name="mail" /><br /><br />
	<input type="submit" name="settings" value="Valider" />
	</form>';

} elseif(isset($_POST['database'])) {
	if(empty($_POST['host']) || empty($_POST['dbuser']) || empty($_POST['dbname']) || empty($_POST['dbpassword'])) {
		echo 'Sorry, one or more fields was left empty.';
	} else {
		$config = "../config.php";
		if(!is_writable($config)) {
			die("Error: Config file not CHMODDED");
		} else {
			$connect = @mysql_connect($_POST['host'], $_POST['dbuser'], $_POST['dbpassword']);
			$database = @mysql_select_db($_POST['dbname']);
			
			if($connect === false || $database === false) {
				echo 'Could not connect to the database';
			} else {
				$fh = fopen($config, 'w') or die("can't open file");
				$stringData = '<?php

	class DATABASE_CONFIG {

	var $default = array(
		'driver' => 'mysql',
		'persistent' => false,
		'host' => ' . $_POST['host'] . '',
		'login' => '' . $_POST['login'] . '',
		'password' => '' . $_POST['password'] . '',
		'database' => '' . $_POST['database_name']',

		'prefix' => '',
	
	);
	var $test = array(
		'driver' => 'mysql',
		'persistent' => false,
		'host' => 'localhost',
		'login' => 'user',
		'password' => 'password',
		'database' => 'test_database_name',
		'prefix' => '',
	);
}
?>';
				fwrite($fh, $stringData);
				fclose($fh);
				echo 'Config created successfully.<br /><a href="?settings=true">Click here to proceed!</a>
				';
			}
		}
	}
} else {
	echo '
	<h2>Welcome to the setup!</h2>
	<p>Please ensure that you have chmodded the config.php file and the files and thumbnails folder to 777, otherwise the script will not install.</p>
	<form name="database" method="post" action="install_script.php">
	Host:<br />
	<input type="text" name="host" value="localhost" /><br />
	Nom de la base de donnée:<br />
	<input type="text" name="database" /><br />
	Nom d\'utilisateur de la base de donnée:<br />
	<input type="text" name="login" /><br />
	Mot de passe de la base de donnée:<br />
	<input type="text" name="password" /><br /><br />
	<input type="submit" name="database" value="Valider" />
	</form>';
} ?>