The document discusses various components and techniques for developing extensions for Joomla! 1.5, including using libraries, retrieving data from requests, working with databases, routing, errors, security, and redirects. It also mentions tools like Aptana and J!Dump that can aid development and covers methods for querying, loading, and receiving results from databases.

1. Building Components for J!1.5 As Presented by Steven Pignataro Owner of ‘corePHP’ Web Development

2. What do we build for? Joomla! 1.5 is built to run on PHP4 and PHP5 Need to keep this in mind when developing extensions. Most developers are dropping support for PHP4 – some are not – you make the choice.

3. Development Applications ‘ corePHP’ Developers use Aptana and extended plugins http://www.aptana.org J!Dump – great tool to get a detailed out put for debugging. http://www.joomlacode.org/gf/project/jdump

4. Where do we start? Joomla! 1.5 has 2 locations that we are going to be developing for: Joomla! Frontend (public accessible) Joomla! Backend (admin accessible)

5. Libraries J!1.5 provides a extensive collection of useful libraries that are easily called via jimport: Jimport(‘joomla.mail.*’); Jimport(‘joomla.filesystem.file’); Open up libraries folder and call by the main folder / sub folder / filename. Can be called like this: Jimport(‘cache.cache’);

6. How to grab from Request Development with PHP Applications require the use of grabbing data from $_GET, $_GET, $_FILES, $_COOKIE, $_REQUEST, etc. Joomla! 1.0.x we used mosGetParam(); we now pull from the JRequest function which gives us additional control: JRequest::setVar() JRequest::getVar()

7. JRequest::GetVar() How do we use it? $value = $JRequest::getVar(‘value’, 0); Other Methods for getting values: getInt() getFloat() getBool() getWord() getCmd() getString() With these get strings we are guaranteeing that the values grabbed will be either an Integer or a String, or any of the other JRequest methods.

8. JRequest::setVar() JReqeust::setVar() methods allows you to set the values into the request. Examples of use are: JRequest::setVar(‘task’, ‘displayData’);

9. Multilingual Support Joomla! allows superior support for UTF-9 (Unicode Transformation Format-8) ecnodting. Available strings are used through JText: _() echo JText::_(‘ARTICLE_COUNT’); sprintf() -> equivalent to PHP sprintf() $value = JText::sprintf(‘ARTICLE # NOT FOUND’, 92); Language INI file will have: ARTICLE # NOT FOUND=Article #%d not found printf() -> equivalent to PHP printf()

10. Database The core of Joomla! has two database drivers: MySQL MySQLi The database can be globalized using JFactory calls: $db =& JFactory::getDBO();

11. How to Query the Database We use setQuery() method to create the object we want to execute: $db =& Jfactory::getDBO(); $query = ‘SELECT * FROM ‘ . $db->nameQuote(‘#__corephp’) . ‘ WHERE ‘ . $db->nameQuote(‘firstname’) . ‘ = ‘ . $db->Quote(‘Steven’) $db->setQuery($query)

12. How to receive results With Joomla! 1.5 we have similar methods that allow us to grab results from the database. In the next few slides I will briefly discuss each one.

13. Database Methods loadResult(): string loadResultArray( numinarray): array Array { [0] => Foo [1] => Bar }

14. Database Methods (cont.) loadAssoc(): array Array { [id] => 25 [name] => Steven } loadAssocList( key: string=‘’): array Array { [0] => Array { [id] => 90 [name] => Steven } [1] => Array { [id] => 91 [name] => Michael } }

15. Database Methods (cont.) loadObject(): stdClass stdClass Object { [id] => 25 [name] => Steven } loadObjectList( key: string=‘’): array Array { [0] => stdClass Object { [id] => 90 [name] => Steven } [1] => stdClass Object { [id] => 91 [name] => Michael } }

16. Database Methods loadRow(): array Array { [0] => Foo [1] => Bar } loadRowList( key: int): array (Example: $db->loadRowList(0)); Array { [0] => Array { [id] => 90 [name] => Steven } [1] => Array { [id] => 91 [name] => Michael } }

17. JRoute Joomla! allows us to take advantage of SEF URI’s – in order to get these we need to use the JRoute::_() method

18. How do we use JRoute? With JRoute you will wrap your links like the following: Echo JRoute::_(‘index.php?option=com_penguinpower&cat=1&data=6’); With SEF Turned on the above link would possible produce something as follows: http://www.corephp.com/index.php/component/penguinpower/1/6/ Not entirely SEF friendly

19. Building the Route To build the route – you need to create a file called router.php in the root of the component folder. Two functions will be abvailable in this file: BuildRoute() ParseRoute() Prefixed prior to above functions is the component name.

20. Example of router.php function penguinpowerBuildRoute(&$query) { $segments = array(); if (isset($query[‘cat’])) { $segments[] = $query[‘cat’]; unset($query[‘cat’]; if(isset($query[‘data’])) { $segments[] = $query[‘data’]; unset($query[‘data’]); } } return $segments; }

21. Example Cont. Function pengiunpowerParseRoute($segments) { $query = array(); if (isset($segments[0])) { $query[‘cat’] = $segments[0]; if (isset($segments[1])) { $query[‘data’] = $segments[1]; } } return $query; }

22. Router.php – the truth Some developers are skipping over this and not realizing the benfit this has to there component. By allowing your users to have high quality SEF links - you are allowing your users to have superior power. It is important to allow your users to have proper SEF links. JRoute gives this ability and is not difficult to use if you are familiar with the previous methods of SEFing a link.

23. Errors J! 1.5 provides superior error messaging over the previous versions of Joomla! by using the class methods: JError::raiseError() JError::raiseWarning() JError::raiseNotice()

24. raiseError JError::raiseError(‘403’, JText::_(‘You are not a penguin – go back north’)); Thins will provide a page with an error message with a 403 message. You can also perform other forms of errors such as 500 when an error occurs.

25. raiseWarning JError::raiseWarning(‘ERROR_CODE’, JText::_(‘What makes a penguin fly during a cold night?’)); This outputs simple messages above the mainBody of the site.

26. ACL Sorry – this is only an hour long – please request further information about ACL and how your site can be improved with ‘corePHP’ Community ACL.

27. Security Remember to start all your files with the following statement (this is one step to security – but do not stop there): Defined(‘_JEXEC’) or die(‘Penguin Bites’);

28. SQL Injection To ensure your code is secure use the following methods to protect your data: $db =& JFactory::getDBO(); $data = $db->QuotegetEscaped(JRequest(‘data’));

29. Extension Access Control There is a simple and easy way to allow access to copmonents and this can be done by doing the following example: $acl =& JFactory::getACL(); $acl ->_mos_add_acl(‘com_penguinpower’, ‘manage’, ‘users’, ‘super administrator’);

30. Redirects Using redirects could be used when saving data / copying items / creating a new item / publishing/unpublishing or anything that you might need to redirect the user to a different location

31. Redirects in use $mainframe->direct(‘index.php?option=com_penguinpower’); or $mainframe->redirect(‘index.php?option=com_the-zend-penguin’, ‘Why fear the Zend Penguin?’);

32. What's next? Well one there is a massive API – no way it can be covered in one sitting. Recommended reading: Mastering Joomla! 1.5 Extension and Framework Development by James Kennard