Converting Old Extensions to Joomla 1.5

				global $mosConfig_abosolute_path;
$path = $mosConfig_abosolute_path.'/file.php';

				$path = JPATH_SITE.DS.'file.php';

				global $mosConfig_abosolute_path;
$path = $mosConfig_abosolute_path.'/administrator/file.php';

				$path = JPATH_ADMINISTRATOR.DS.'file.php';

				$path = JPATH_COMPONENT.DS.'file.php';

				$document=& JFactory::getDocument();
$document->setTitle($title);

				$document=& JFactory::getDocument();
$title = $document->getTitle();

				$app = &JFactory::getApplication();
$limit = $app->getCfg('list_limit');

global $mosConfig_offset_user;

				$user = &JFactory::getUser();
$userOffset = $user->getParam('timezone');

				global $mosConfig_debug;

if ($mosConfig_debug) // ...

				if (JDEBUG) // ...

// or

$app = &JFactory::getApplication();
if ($app->getCfg('debug')) // ...

				$ints = JRequest::getVar($name, array(), 'method', 'array');
JArrayHelper::toInteger($ints);

				$comp = new mosComponent($database);
$comp->load($foobar_id);
$params = new mosParameters($comp->params);

				$params = JComponentHelper::getParams('com_foobar');

				// Providing object is derived from JTable
$object->bind($array, $ignore);

				jimport('joomla.filesystem.path');
$path = JPath::clean($p_path);
// Handle trailing slash manually

				jimport('joomla.user.helper');
$pwd = JUserHelper::genRandomPassword();

				$app = &JFactory::getApplication();
$app->redirect($url, $msg);

				jimport('joomla.filesystem.folder');
$result = JFolder::create($base.$path, $mode == null ? 0755 : $mode);

				jimport('joomla.filesystem.folder');
$result = JFolder::delete($path);

				jimport('joomla.filesystem.path');
$result = JPath::setPermissions($path);

				jimport('joomla.filesystem.path');
$result = JPath::setPermissions($path, $filemode, $dirmode);

				jimport('joomla.filesystem.path');
$result = JPath::canChmod($file);

				jimport('joomla.environment.browser');
$browser = &JBrowser::getInstance();

				jimport('joomla.environment.browser');
$browser = &JBrowser::getInstance();
$os = $instance->getPlatform();

				$registry = new JRegistry();
$registry->loadINI($txt);
$params = $registry->toObject();
// or
$params = new JParameter($txt);

				$editor = &JFactory::getEditor();
echo $editor->initialise();

				jimport('joomla.html.editor');
$editor = &JFactory::getEditor();
echo $editor->save($hiddenField);

				jimport( 'joomla.html.editor' );
$editor = &JFactory::getEditor();
echo $editor->display($hiddenField, $content, $width, $height, $col, $row);

				$user =& JFactory::getUser();
$menus =& JSite::getMenu();
$allowed = $menus->authorize($Itemid, $user->get('aid')); 

Place the following code before the end of your form:

<?php echo JHtml::_('form.token'); ?>

initGzip();
doGzip();

				class MyTable extends mosDBTable {
 // lots of variables defined
 function MyTable(&$db) {
  $this->mosDBTable('#__table_name', 'id', $db);
 }
}

				class MyTable extends JTable {
 // lots of variables defined
 function __construct(&$db) {
   parent::__construct('#__table_name', 'id', $db);
 }
}

				$sql = 'SELECT *'
     . ' FROM #__table_name'
     . ' LIMIT 10, 20';
$database->setQuery($sql);

				$db = &JFactory::getDbo();
$db->setQuery(
 'SELECT *'
 .' FROM #__table_name'
 .' LIMIT 10, 20',
 10, 20
);

				$comp = new mosComponent($database);
$comp->load($foobar_id);
$params = new mosParameters($comp->params);

				$params = JComponentHelper::getParams('com_foobar');

				$cache =& JFactory::getCache($group);
$cache->clean($group);

				JToolBarHelper::publishList();
JToolBarHelper::unpublishList();
JToolBarHelper::addNew();
JToolBarHelper::editList();
JToolBarHelper::deleteList();
JToolBarHelper::spacer();

				jimport('joomla.html.html.grid');
echo JHTML::_('grid.checkedOut',$row, $overlib);

				jimport('joomla.html.html.grid');
echo JHTML::_('grid.checkedout', $row, $i);

JToolbarHelper::save('saveedit');

				$dispatcher =& JDispatcher::getInstance();
$result = $dispatcher->trigger($event, $arguments);

				<?php
// Files saved as PHP files
define('_COMMENTS_TITLE', 'Title');
define('_COMMENTS_GUEST_TO_POST', 'Allow guests to post');

				# Files must be saved as UTF-8 in INI format
COMMENTS_TITLE=Title
COMMENTS_GUEST_TO_POST=Allow guests to post