problema creazione db

[Cooly]

salve ragazzi ho creato un file install.php
dove mi permette di creare il database inserendo i dati e i login admin il problema penso sia un bug del codice che anche se metto i nomi errati del db mi dice che in automatico e stato creato...anche se invento i dati e possibile risolvere questo bug?

<?php
}function step_3(){
  if (isset($_POST['submit']) && $_POST['submit']=="Install!") {
   $database_host=isset($_POST['database_host'])?$_POST['database_host']:"";
   $database_name=isset($_POST['database_name'])?$_POST['database_name']:"";
   $database_username=isset($_POST['database_username'])?$_POST['database_username']:"";
   $database_password=isset($_POST['database_password'])?$_POST['database_password']:"";
   $admin_name=isset($_POST['admin_name'])?$_POST['admin_name']:"";
   $admin_password=isset($_POST['admin_password'])?$_POST['admin_password']:"";
  
  if (empty($admin_name) || empty($admin_password) || empty($database_host) || empty($database_username) || empty($database_name)) {
   echo "All fields are required! Please re-enter.<br />";
  } else {
   $connection = mysql_connect($database_host, $database_username, $database_password);
   mysql_select_db($database_name, $connection);
  
   $file ='data.sql';
   if ($sql = file($file)) {
   $query = '';
   foreach($sql as $line) {
    $tsl = trim($line);
   if (($sql != '') && (substr($tsl, 0, 2) != "--") && (substr($tsl, 0, 1) != '#')) {
   $query .= $line;
  
   if (preg_match('/;\s*$/', $line)) {
  
    mysql_query($query, $connection);
    $err = mysql_error();
    if (!empty($err))
      break;
   $query = '';
   }
   }
   }
   @mysql_query("INSERT INTO admin SET admin_name='".$admin_name."', admin_password = md5('" . $admin_password . "')");
   mysql_close($connection);
   }
   $f=fopen("config.php","w");
   $database_inf="<?php
     define('DATABASE_HOST', '".$database_host."');
     define('DATABASE_NAME', '".$database_name."');
     define('DATABASE_USERNAME', '".$database_username."');
     define('DATABASE_PASSWORD', '".$database_password."');
     define('ADMIN_NAME', '".$admin_name."');
     define('ADMIN_PASSWORD', '".$admin_password."');
     ?>";
  if (fwrite($f,$database_inf)>0){
   fclose($f);
  }
  header("Location: install.php?step=4");
  }
  }
?>
  <form method="post" action="install.php?step=3">
  <p>
   <input type="text" name="database_host" value='localhost' size="30">
   <label for="database_host">Database Host</label>
 </p>
 <p>
   <input type="text" name="database_name" size="30" value="<?php echo $database_name; ?>">
   <label for="database_name">Database Name</label>
 </p>
 <p>
   <input type="text" name="database_username" size="30" value="<?php echo $database_username; ?>">
   <label for="database_username">Database Username</label>
 </p>
 <p>
   <input type="text" name="database_password" size="30" value="<?php echo $database_password; ?>">
   <label for="database_password">Database Password</label>
  </p>
  <br/>
  <p>
   <input type="text" name="admin_name" size="30" value="<?php echo $username; ?>">
   <label for="username">Admin Login</label>
 </p>
 <p>
   <input name="admin_password" type="text" size="30" maxlength="15" value="<?php echo $password; ?>">
   <label for="password">Admin Password</label>
  </p>
 <p>
   <input type="submit" name="submit" value="Install!">
  </p>
  </form>
<?php
}

praticamente passa allo step 4 perchè l'ho suddiviso in 4 step il processo di installazione