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This has been partly implemented in some plugins (others have boxes that do not function).

NB Some parameters were 'extras2' and others were 'extra2' - have standardised on 'extra2'

I have added saving and restoring code for all 10 'Extra code' boxes to the Plugin Helper. This should work automatically if the helper save_conf function is called by the plugin.

NB Array values are converted into 'ini' style strings before saving.

Load code from helpers/plugin.php is

// initialise extras
$extras = range(1, 10);
foreach ($extras as $k => $v ) {
    $extras[$k] = "extra$v";
}
foreach ( $extras as $extra ) {
    $$extra = new JParameter($row->$extra);
}

Save function is

    function save_conf( $option )
    {
        global $mainframe;

        //$db =& JFactory::getDBO();
        $post = JRequest::get( 'post' , JREQUEST_ALLOWRAW );

        $row =& JTable::getInstance('chronocontactplugins', 'Table');
        if ( !$row->bind( $post ) ) {
            JError::raiseWarning(100, $row->getError());
            $mainframe->redirect( "index2.php?option=$option" );
        }

        $params = JRequest::getVar( 'params', '', 'post', 'array', array(0) );
        //$mainframe->enqueuemessage(print_r($params, true));
        if ( is_array( $params ) ) {
            $txt = array();
            foreach ( $params as $k => $v ) {
                if ( is_array($v) ) {
                    $v = implode('|', $v);
                }
                if ( $v ) {
                    $txt[] = "$k=$v";
                }
            }
            $row->params = implode( "\n", $txt );
        }
        // process extras
        $extras = range(1, 10);
        foreach ($extras as $k => $v ) {
            $extras[$k] = "extra$v";
        }
        foreach ( $extras as $extra ) {
            $value = JRequest::getVar( $extra, '', 'post' );
            //$mainframe->enqueuemessage('Value: '.print_r($value, true));
            if ( is_array( $value ) ) {
                $txt = array();
                foreach ( $value as $k => $v) {
                    if ( $v ) {
                        $txt[] = "$k=$v";
                    }
                }
                $row->$extra = implode( "\n", $txt );
            }
           }
        //$mainframe->enqueuemessage(print_r($row, true));
        if ( !$row->store() ) {
            JError::raiseWarning(100, $row->getError());
            $mainframe->redirect( "index2.php?option=$option" );
        }

        $mainframe->redirect( "index2.php?option=".$option, "Config Saved" );
        $row =& JTable::getInstance('chronocontactplugins', 'Table');
    }