43.5. Zend_Service

43.5. Zend_Service_Delicious
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43.5.1. Introduction

Zend_Service_Delicious is simple API for using del.icio.us XML and JSON web services. This component gives you read-write access to posts at del.icio.us if you provide credentials. It also allows read-only access to public data of all users.

例 43.14. Get all posts

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getAllPosts();

foreach ($posts as $post) {
    echo "--\n";
    echo "Title: {$post->getTitle()}\n";
    echo "Url: {$post->getUrl()}\n";
}

43.5.2. Retrieving posts

Zend_Service_Delicious provides three methods for retrieving posts: getPosts(), getRecentPosts() and getAllPosts(). All of these methods return an instance of Zend_Service_Delicious_PostList, which holds all retrieved posts.

/**
 * Get posts matching the arguments. If no date or url is given,
 * most recent date will be used.
 *
 * @param string $tag Optional filtering by tag
 * @param Zend_Date $dt Optional filtering by date
 * @param string $url Optional filtering by url
 * @return Zend_Service_Delicious_PostList
 */
public function getPosts($tag = null, $dt = null, $url = null);

/**
 * Get recent posts
 *
 * @param string $tag   Optional filtering by tag
 * @param string $count Maximal number of posts to be returned
 *                      (default 15)
 * @return Zend_Service_Delicious_PostList
 */
public function getRecentPosts($tag = null, $count = 15);

/**
 * Get all posts
 *
 * @param string $tag Optional filtering by tag
 * @return Zend_Service_Delicious_PostList
 */
public function getAllPosts($tag = null);

43.5.3. Zend_Service_Delicious_PostList

Instances of this class are returned by the getPosts(), getAllPosts(), getRecentPosts(), and getUserPosts() methods of Zend_Service_Delicious.

For easier data access this class implements the Countable, Iterator, and ArrayAccess interfaces.

例 43.15. Accessing post lists

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getAllPosts();

// count posts
echo count($posts);

// iterate over posts
foreach ($posts as $post) {
    echo "--\n";
    echo "Title: {$post->getTitle()}\n";
    echo "Url: {$post->getUrl()}\n";
}

// get post using array access
echo $posts[0]->getTitle();

	注意
	The `ArrayAccess::offsetSet()` and `ArrayAccess::offsetUnset()` methods throw exceptions in this implementation. Thus, code like `unset($posts[0]);` and `$posts[0] = 'A';` will throw exceptions because these properties are read-only.

Post list objects have two built-in filtering capabilities. Post lists may be filtered by tags and by URL.

例 43.16. Filtering a Post List with Specific Tags

Posts may be filtered by specific tags using withTags(). As a convenience, withTag() is also provided for when only a single tag needs to be specified.

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getAllPosts();

// Print posts having "php" and "zend" tags
foreach ($posts->withTags(array('php', 'zend')) as $post) {
    echo "Title: {$post->getTitle()}\n";
    echo "Url: {$post->getUrl()}\n";
}

例 43.17. Filtering a Post List by URL

Posts may be filtered by URL matching a specified regular expression using the withUrl() method:

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getAllPosts();

// Print posts having "help" in the URL
foreach ($posts->withUrl('/help/') as $post) {
    echo "Title: {$post->getTitle()}\n";
    echo "Url: {$post->getUrl()}\n";
}

43.5.4. Editing posts

例 43.18. Post editing

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getPosts();

// set title
$posts[0]->setTitle('New title');
// save changes
$posts[0]->save();

例 43.19. Method call chaining

Every setter method returns the post object so that you can chain method calls using a fluent interface.

$delicious = new Zend_Service_Delicious('username', 'password');
$posts = $delicious->getPosts();

$posts[0]->setTitle('New title')
         ->setNotes('New notes')
         ->save();

43.5.5. Deleting posts

There are two ways to delete a post, by specifying the post URL or by calling the delete() method upon a post object.

例 43.20. Deleting posts

$delicious = new Zend_Service_Delicious('username', 'password');

// by specifying URL
$delicious->deletePost('http://framework.zend.com');

// or by calling the method upon a post object
$posts = $delicious->getPosts();
$posts[0]->delete();

// another way of using deletePost()
$delicious->deletePost($posts[0]->getUrl());

43.5.6. Adding new posts

To add a post you first need to call the createNewPost() method, which returns a Zend_Service_Delicious_Post object. When you edit the post, you need to save it to the del.icio.us database by calling the save() method.

例 43.21. Adding a post

$delicious = new Zend_Service_Delicious('username', 'password');

// create a new post and save it (with method call chaining)
$delicious->createNewPost('Zend Framework', 'http://framework.zend.com')
          ->setNotes('Zend Framework Homepage')
          ->save();

// create a new post and save it  (without method call chaining)
$newPost = $delicious->createNewPost('Zend Framework',
                                     'http://framework.zend.com');
$newPost->setNotes('Zend Framework Homepage');
$newPost->save();

43.5.7. Tags

例 43.22. Tags

$delicious = new Zend_Service_Delicious('username', 'password');

// get all tags
print_r($delicious->getTags());

// rename tag ZF to zendFramework
$delicious->renameTag('ZF', 'zendFramework');

43.5.8. Bundles

例 43.23. Bundles

$delicious = new Zend_Service_Delicious('username', 'password');

// get all bundles
print_r($delicious->getBundles());

// delete bundle someBundle
$delicious->deleteBundle('someBundle');

// add bundle
$delicious->addBundle('newBundle', array('tag1', 'tag2'));

43.5.9. Public data

The del.icio.us web API allows access to the public data of all users.

表 43.10. Methods for retrieving public data

Name	Description	Return type
`getUserFans()`	Retrieves fans of a user	Array
`getUserNetwork()`	Retrieves network of a user	Array
`getUserPosts()`	Retrieves posts of a user	Zend_Service_Delicious_PostList
`getUserTags()`	Retrieves tags of a user	Array

	注意
	When using only these methods, a username and password combination is not required when constructing a new `Zend_Service_Delicious` object.

例 43.24. Retrieving public data

// username and password are not required
$delicious = new Zend_Service_Delicious();

// get fans of user someUser
print_r($delicious->getUserFans('someUser'));

// get network of user someUser
print_r($delicious->getUserNetwork('someUser'));

// get tags of user someUser
print_r($delicious->getUserTags('someUser'));

43.5.9.1. Public posts

When retrieving public posts with the getUserPosts() method, a Zend_Service_Delicious_PostList object is returned, and it contains Zend_Service_Delicious_SimplePost objects, which contain basic information about the posts, including URL, title, notes, and tags.

表 43.11. Methods of the Zend_Service_Delicious_SimplePost class

Name	Description	Return type
`getNotes()`	Returns notes of a post	String
`getTags()`	Returns tags of a post	Array
`getTitle()`	Returns title of a post	String
`getUrl()`	Returns URL of a post	String

43.5.10. HTTP client

Zend_Service_Delicious uses Zend_Rest_Client for making HTTP requests to the del.icio.us web service. To change which HTTP client Zend_Service_Delicious uses, you need to change the HTTP client of Zend_Rest_Client.

例 43.25. Changing the HTTP client of Zend_Rest_Client

$myHttpClient = new My_Http_Client();
Zend_Rest_Client::setHttpClient($myHttpClient);

When you are making more than one request with Zend_Service_Delicious to speed your requests, it's better to configure your HTTP client to keep connections alive.

例 43.26. Configuring your HTTP client to keep connections alive

Zend_Rest_Client::getHttpClient()->setConfig(array(
        'keepalive' => true
));

	注意
	When a `Zend_Service_Delicious` object is constructed, the SSL transport of `Zend_Rest_Client` is set to `'ssl'` rather than the default of `'ssl2'`. This is because del.icio.us has some problems with `'ssl2'`, such as requests taking a long time to complete (around 2 seconds).

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43.5. Zend_Service_Delicious