如何在windows中的wamp中启用memcached

Iam运行WAMP服务器，刚刚启用php_memcache扩展，并尝试了代码

<?php
    $memcache = new Memcache;
    $memcache->connect('localhost', 11211) or die ("Could not connect");
    $version = $memcache->getVersion();
    echo "Server's version: ".$version."<br/>'n";
    $tmp_object = new stdClass;
    $tmp_object->str_attr = 'test';
    $tmp_object->int_attr = 123;
    $memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
    echo "Store data in the cache (data will expire in 10 seconds)<br/>'n";
    $get_result = $memcache->get('key');
    echo "Data from the cache:<br/>'n";
    var_dump($get_result);
?>