[dokuwiki] [Problem][own plugin] dont stop after end

Hello i have writen a syntax plugin but i have an error after </drop>
it render all the rest  with the links (everytime new links)

<code>
<?php


/**
<?php
/**
 * Plugin Color: Sets new colors for text and background.
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Christopher Smith <chris@xxxxxxxxxxxxx>
 */

// must be run within Dokuwiki
if (!defined('DOKU_INC'))
        die();

if (!defined('DOKU_PLUGIN'))
        define('DOKU_PLUGIN', DOKU_INC . 'lib/plugins/');
require_once (DOKU_PLUGIN . 'syntax.php');

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class syntax_plugin_drop_me extends DokuWiki_Syntax_Plugin {


        /**
         * return some info
         */
        function getInfo() {
                return array (
                        'author' => 'Jan-Philipp Warmers',
                        'email' => 'Progamler@xxxxxxxxxxxxxxxxx',
                        'date' => '2007-07-04',
                        'name' => 'Drop ME',
                        'desc' => 'Creat menüs with display and js',
                        'url' => '',


                );
        }

        function getType() {
                return 'formatting';
        }
        function getAllowedTypes() {
                return array (
                        'formatting',
                        'substition',
                        'disabled',
                        'container'
                );
        }
        function getSort() {
                return 158;
        }
        function connectTo($mode) {
$this->Lexer->addEntryPattern('<drop.*?>(?=.*?</drop>)', $mode, 'plugin_drop_me');
        }
        function postConnect() {
                $this->Lexer->addExitPattern('</drop>', 'plugin_drop_me');
        }

        /**
         * Handle the match
         */
        function handle($match, $state, $pos, & $handler) {
                switch ($state) {
                        case DOKU_LEXER_ENTER :
list ($color, $background) = preg_split("/\//u", substr($match, 5, -1), 2);
                                if ($color = $this->_link($color, $background)) 
{
                                        $color = $color;
                                }
                                return array (
                                        $state,
                                        array (
                                                $color,
                                                $background
                                        )
                                );

                        case DOKU_LEXER_UNMATCHED :
                                return array (
                                        $state,
                                        $match
                                );
                        case DOKU_LEXER_EXIT :
                                return array (
                                        $state,
                                        ''
                                );
                }
                return array ();
        }

        /**
         * Create output
         */
        function render($mode, & $renderer, $data) {
                global $color_ende;
                if ($mode == 'xhtml') {
                        list ($state, $match) = $data;
                        switch ($state) {
                                case DOKU_LEXER_ENTER :
                                        list ($color, $background, $ende) = 
$match;
                                        $renderer->doc .= $color;
                                        break;

                                case DOKU_LEXER_UNMATCHED :
                                        $renderer->doc .= 
$renderer->_xmlEntities($match);
                                        break;
                                case DOKU_LEXER_EXIT :
                                        $renderer->doc .= $this->_ende($color);
                                        break;
                        }
                        return true;
                }
                return false;
        }

        function _link($c, $o) {
                $c = trim($c);
                if ($c == "link") {
                        $color_ende = "</a>";
                        return "<a href=javascript:showhide('$o')  
onclik=showhide('$o')>";
                }
                elseif ($c == "menu") {
                        $color_ende = "</div>";
                        return "<div id=\"$o\" >";
                }
        }
        function _ende($ende) {
                $c = trim($ende);
                $c = substr($c, "1", "1");

                if ($c == "a") {

                        return "</a>";
                }
                elseif ($c == "d") {

                        return "</div>";
                }
        }
}
?>
</code>

thx Jan-Philipp Warmers

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