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<?php
defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.plugin.plugin' );

class plgContentColumns extends JPlugin
{
  function plgContentColumns( &$subject, $params )
  {
    parent::__construct( $subject, $params );
  }

  // before content is sent to the browser, it is wrapped in columns.
  function onPrepareContent( &$article, &$params, $limitstart )
  {
    $article->text = "<table class=\"columns\" ".
                     "       cellpadding=\"0\" cellspacing=\"0\">".
                     "<tr><td>".
                     str_replace('{next-column}','</td><td>', $article->text).
                     "</td></tr>".
                     "</table>";
    return true;
  }
}
?>

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table.columns td {
  width: 50%;
  padding: 0px 5px 0px 5px;
}

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<?xml version="1.0" encoding="utf-8"?>
<install version="1.5" type="plugin" group="content">
  <name>Content - Columns</name>
  <author>Johan</author>
  <creationDate>June 2010</creationDate>
  <copyright>Use it if you like.</copyright>
  <license></license>
  <authorEmail></authorEmail>
  <authorUrl></authorUrl>
  <version>1.0</version>
  <description>Column layout for content</description>
  <files>
    <filename plugin="columns">columns.php</filename>
  </files>
  <params>
    <param name="cssclass" type="text" default="columns" label="CSS Class" 
           description="The CSS class for the table creating the columns."/>
  </params>
</install>

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  // before content is sent to the browser, it is wrapped in columns.
  function onPrepareContent( &$article, &$params, $limitstart )
  {
    $plugin = & JPluginHelper::getPlugin('content', 'columns');

    // Load plugin params info
    $pluginParams = new JParameter($plugin->params);
    $cssclass = $pluginParams->get('cssclass', 'columns');

    $start_count = substr_count($article->text, "{first-column}");
    $end_count = substr_count($article->text, "{last-column}");

    if($start_count > 0)
    {
      if($start_count > $end_count)
      {
        $article->text = "<p>Missing {last-column}</p>".$article->text;
      }
      else
      {
        $pattern = array();
        $replace = array();

        $pattern[] = "{first-column}";
        $replace[] = "<table class=\"".$cssclass."\" cellspacing=\"0\" ".
                     "cellpadding=\"0\"><tr><td>";

        $pattern[] = "{next-column}";
        $replace[] = "</td><td>";

        $pattern[] = "{last-column}";
        $replace[] = "</td></tr></table>";

        $article->text = str_replace($pattern, $replace, $article->text);
      }
    }

    return true;
  }

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INSERT INTO jos_plugins (name, element, folder, published)
VALUES ('Content - Columns', 'columns', 'content', 1);

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<?php
defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.plugin.plugin' );

class plgContentColumns extends JPlugin
{
  function plgContentColumns( &$subject, $params )
  {
    parent::__construct( $subject, $params );
  }

  // before content is sent to the browser, it is wrapped in columns.
  function onPrepareContent( &$article, &$params, $limitstart )
  {
    $plugin = & JPluginHelper::getPlugin('content', 'columns');

    // Load plugin params info
    $pluginParams = new JParameter($plugin->params);
    $cssclass = $pluginParams->get('cssclass', 'columns');

    $start_count = substr_count($article->text, "{first-column}");
    $end_count = substr_count($article->text, "{last-column}");

    if($start_count > 0)
    {
      if($start_count > $end_count)
      {
        $article->text = "<p>Missing {last-column}</p>".$article->text;
      }
      else
      {
        $pattern = array();
        $replace = array();

        $pattern[] = "{first-column}";
        $replace[] = "<table class=\"".$cssclass."\" cellspacing=\"0\" ".
                     "cellpadding=\"0\"><tr><td>";

        $pattern[] = "{next-column}";
        $replace[] = "</td><td>";

        $pattern[] = "{last-column}";
        $replace[] = "</td></tr></table>";

        $article->text = str_replace($pattern, $replace, $article->text);
      }
    }

    return true;
  }
}
?>

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<h1>this text is shown in full width, so there should be no columns yet.</h1>
<p>{first-column} this is the first column, it is on the left. remember, that table, tr and td elements are inserted by the plugin on the spots where you put the first-column, next-column and last-column markers. if you put something in css that kills the tables (hides them all for instance) then you will indeed see no columns, because you cannot see any tables! {next-column}</p>
<p>this is the second column. i type some extra text here, just to give this column a bit of a body.</p>
<p>{last-column}</p>
<p>this text is, again, shown in full width. there should be no columns anymore. it is not too complicated actually, just check to make sure you have no typing errors.</p>

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table.columns td {
  width: 50%;
  padding: 0px 5px 0px 5px;
  vertical-align: top;  /* this line was added */
}