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Home arrow Developer Manual arrow 4. Mambots arrow An onPrepareContent Mambot

An onPrepareContent Mambot PDF Print E-mail
Here is a code framework for a mambot that it triggered by the onPrepareContent event (this is the traditional Mambot).
* @version $Id $
* @package Joomla
* @copyright Copyright (C) 2005 Open Source Matters. All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.php
* Joomla! is free software and parts of it may contain or be derived from the
* GNU General Public License or other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
/** ensure this file is being included by a parent file */
defined( '_VALID_MOS' ) or die( 'Direct Access to this location is not allowed.' );
$_PLUGINS->registerFunction( 'onPrepareContent', 'botMosLink' );
* Link bot
* <b>Usage:</b>
* <code>{moslink id="the_id"}</code>
function botMosLink( $published, &$row, $mask=0, $page=0  ) {
  global $mosConfig_absolute_path;
  if (!$published) {
    return true;
  require_once( $mosConfig_absolute_path . '/includes/domit/xml_saxy_lite_parser.php' );
  // define the regular expression for the bot
  $regex = "#{moslinks*(.*?)}#s";
  // perform the replacement
  $row->text = preg_replace_callback( $regex, 'botMosLink_replacer', $row->text );
  return true;
* Replaces the matched tags an image
* @param array An array of matches (see preg_match_all)
* @return string
function botMosLink_replacer( &$matches ) {
  $attribs = @SAXY_Lite_Parser::parseAttributes( $matches[1] );
  $id = @$attribs['id'];
  return '<a href="'.sefRelToAbs( 'index.php?option=com_content&task=view&id=' . $id ).'">Link</a>';
Functions called by the onPrepareContent event have a required arguments list:
function function_name( int $published, object &$row, int $mask=0, int $page=0 )
1 if the mambot is published, 0 if not
A variable reference to the content object
The current mask, default is 0
The current page number, default is 0
The trigger for the onPrepareContent event allows for unpublished mambots to still be processed.

The use of the built in preg_replace_callback function is a very efficient way of replacing the link tags. Once you define your regular expression, the nominated callback function is called. You simply return the string you want as a replacement for the regular expression.

You may wonder why we pass a 'published' argument. Some Mambots will need to do something if they are not published. For example, the mosimage Mambot needs to remove all of the tags from the text if it is not published.
Last Updated ( Thursday, 15 September 2005 )
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