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Picasa API を使用してコミュニティ検索を行っていますが、検索結果にもサムネイルを表示したいと考えています。どうすればいいですか？結果にサムネイルを表示し、サムネイルをクリックすると Web アルバムの画像に移動する必要があります。

<?php

require_once 'Zend/Loader.php';

Zend_Loader::loadClass('Zend_Gdata_Photos');
Zend_Loader::loadClass('Zend_Gdata_ClientLogin');
Zend_Loader::loadClass('Zend_Gdata_AuthSub');
Zend_Loader::loadClass('Zend_Gdata_Query');

$search=$_REQUEST['id'];

$serviceName = Zend_Gdata_Photos::AUTH_SERVICE_NAME;
$user = "abc@gmail.com";
$pass = "password";


$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $serviceName);

$gp = new Zend_Gdata_Photos($client, "Google-DevelopersGuide-1.0");

// Community search queries aren't currently supported through a separate
// class in the PHP client library.  However, we can use the generic 
// Zend_Gdata_Query class as an alternative

// URL for a community search request
// Creates a Zend_Gdata_Query
$query = $gp->newQuery("https://picasaweb.google.com/data/feed/api/all");

// looking for photos in the response
$query->setParam("kind", "photo");

// full text search
$query->setQuery($search);

// maximum of 10 results
$query->setMaxResults("6");

// There isn't a specific class for representing a feed of community
// search results, but the Zend_Gdata_Photos_UserFeed understands
// photo entries, so we'll use that class
$userFeed = $gp->getUserFeed(null, $query);
foreach ($userFeed as $photoEntry) 
{
 echo $photoEntry->getTitle()->getText() . "</br > ";
// The 'alternate' link on a photo represents the link to
// the image page on Picasa Web Albums
$link=$photoEntry->getLink('alternate')->getHref();
echo "<img src='".$link."'>";
echo '<a href="'.$link.'">'.$photoEntry->getLink('alternate')->getHref().'</a> <br />';
echo "<br />\n";

}

?>
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