feed-io is a PHP library built to consume and serve news feeds. It features:

• JSONFeed / Atom / RSS read and write support
• Feeds auto-discovery through HTML headers
• a Command line interface to discover and read feeds
• Multiple feeds reading at once through asynchronous requests
• PSR-7 Response generation with accurate cache headers
• HTTP Headers support when reading feeds in order to save network traffic
• Detection of the format (RSS / Atom) when reading feeds
• Enclosure support to handle external medias like audio content
• PSR compliant logging
• Content filtering to fetch only the newest items
• Malformed feeds auto correction
• DateTime detection and conversion
• A generic HTTP ClientInterface
• Guzzle Client integration

Keep informed about new releases and incoming features : https://debril.org/categories/feed-io

Use Composer to add feed-io into your project's requirements :

    composer require debril/feed-io

feed-io requires :

• php 7.1+
• psr/log 1.0
• guzzlehttp/guzzle 6.2+

it suggests :

• monolog/monolog 1.10+

Monolog is not the only library suitable to handle feed-io's logs, you can use any PSR/Log compliant library instead.

No problem, you can still install feed-io 3.0. This version will be supported until the end of PHP 5.6 security fixes (31 december 2018).

feed-io 4 requires PHP 7.1+ because return types cannot be nullable in PHP 7.0.

Do this if you want to contribute (and you're welcome to do so):

    git clone https://github.com/alexdebril/feed-io.git

    cd feed-io/

    composer install

# Unit Testing

You can run the unit test suites using the following command in the library's source directory:

    ./vendor/bin/phpunit

Let's suppose you installed feed-io using Composer, you can use its command line client to read feeds from your terminal :

./vendor/bin/feedio read http://php.net/feed.atom

You can specify the number of items you want to read using the --count option. The instruction below will display the latest item :

./vendor/bin/feedio read -c 1 http://php.net/feed.atom

feed-io is designed to read feeds across the internet and to publish your own. Its main class is FeedIo :

// create a simple FeedIo instance
$feedIo = \FeedIo\Factory::create()->getFeedIo();

// read a feed
$result = $feedIo->read($url);

// or read a feed since a certain date
$result = $feedIo->readSince($url, new \DateTime('-7 days'));

// get title
$feedTitle = $result->getFeed()->getTitle();

// iterate through items
foreach( $result->getFeed() as $item ) {
    echo $item->getTitle();
}

Thanks to Guzzle, feed-io is able to fetch several feeds at once through asynchronous requests. If you're willing to get more information about the way it works, you can read Guzzle's documentation.

To read feeds using asynchronous requests with feed-io, you need to send a pool of \FeedIo\Async\Request objects to \FeedIo\FeedIo::readAsync and handle the result with a \FeedIo\Async\CallbackInterface of your own. You can also use \FeedIo\Async\DefaultCallback in order to test the feature.

Each \FeedIo\Async\Request is a request you want to perform, it embeds the feed's URL and optionnally a \DateTime to define the modified-since attribute of the request.

The CallbackInterface instance needs two methods :

  /**
   * @param Result $result
   */
  public function process(Result $result) : void;

  /**
   * @param Request $request
   * @param \Exception $exception
   */
  public function handleError(Request $request, \Exception $exception) : void;

process() is called on successful reading and parsing to let you process the result. Otherwise handleError() will be triggered on faulty calls. Here is an example : PDOCallback

A web page can refer to one or more feeds in its headers, feed-io provides a way to discover them :

$feedIo = \FeedIo\Factory::create()->getFeedIo();

$feeds = $feedIo->discover($url);

foreach( $feeds as $feed ) {
    echo "discovered feed : {$feed}";
}

Or you can use feed-io's command line :

./vendor/bin/feedio discover https://a-website.org

You'll get all discovered feeds in the output.

// build the feed
$feed = new FeedIo\Feed;
$feed->setTitle('...');

// convert it into Atom
$atomString = $feedIo->toAtom($feed);

// or ...
$atomString = $feedIo->format($feed, 'atom');

// build the feed
$feed = new FeedIo\Feed;
$feed->setTitle('...');

$item = $feed->newItem();

// add namespaces
$feed->setNS(
    'itunes', //namespace
    'http://www.itunes.com/dtds/podcast-1.0.dtd' //dtd for the namespace
        );
$feed->set('itunes,title', 'Sample Title'); //OR any other element defined in the namespace.
$item->addElement('itunes:category', 'Education');

// build the media
$media = new \FeedIo\Feed\Item\Media
$media->setUrl('http://yourdomain.tld/medias/some-podcast.mp3');
$media->setType('audio/mpeg');

// add it to the item
$item->addMedia($media);

$feed->add($item);

You can turn a \FeedIo\FeedInstance directly into a PSR-7 valid response using \FeedIo\FeedIo::getPsrResponse() :

$feed = new \FeedIo\Feed;

// feed the beast ...
$item = new \FeedIo\Feed\Item;
$item->set ...
$feed->add($item);

$atomResponse = $feedIo->getPsrResponse($feed, 'atom');

$jsonResponse = $feedIo->getPsrResponse($feed, 'json');

feed-io natively supports PSR-3 logging, you can activate it by choosing a 'builder' in the factory :

$feedIo = \FeedIo\Factory::create(['builder' => 'monolog'])->getFeedIo();

feed-io only provides a builder to create Monolog\Logger instances. You can write your own, as long as the Builder implements BuilderInterface.

To create a new FeedIo instance you only need to inject two dependencies :

• an HTTP Client implementing FeedIo\Adapter\ClientInterface. It can be wrapper for an external library like FeedIo\Adapter\Guzzle\Client
• a PSR-3 logger implementing Psr\Log\LoggerInterface

// first dependency : the HTTP client
// here we use Guzzle as a dependency for the client
$guzzle = new GuzzleHttp\Client();
// Guzzle is wrapped in this adapter which is a FeedIo\Adapter\ClientInterface  implementation
$client = new FeedIo\Adapter\Guzzle\Client($guzzle);

// second dependency : a PSR-3 logger
$logger = new Psr\Log\NullLogger();

// now create FeedIo's instance
$feedIo = new FeedIo\FeedIo($client, $logger);

Another example with Monolog configured to write on the standard output :

use FeedIo\FeedIo;
use FeedIo\Adapter\Guzzle\Client;
use GuzzleHttp\Client as GuzzleClient;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;

$client = new Client(new GuzzleClient());
$logger = new Logger('default', [new StreamHandler('php://stdout')]);

$feedIo = new FeedIo($client, $logger);

You can configure Guzzle before injecting it to FeedIo :

use FeedIo\FeedIo;
use FeedIo\Adapter\Guzzle\Client;
use GuzzleHttp\Client as GuzzleClient;
use \Psr\Log\NullLogger;

// We want to timeout after 3 seconds
$guzzle = new GuzzleClient(['timeout' => 3]);
$client = new Client($guzzle);

$logger = new NullLogger();

$feedIo = new \FeedIo\FeedIo($client, $logger);

Please read Guzzle's documentation to get more information about its configuration.

To prevent your application from hitting the same feeds multiple times, you can inject Kevin Rob's cache middleware into Guzzle's instance :

use FeedIo\FeedIo;
use FeedIo\Adapter\Guzzle\Client;
use GuzzleHttp\Client As GuzzleClient;
use GuzzleHttp\HandlerStack;
use Kevinrob\GuzzleCache\CacheMiddleware;
use Psr\Log\NullLogger;

// Create default HandlerStack
$stack = HandlerStack::create();

// Add this middleware to the top with `push`
$stack->push(new CacheMiddleware(), 'cache');

// Initialize the client with the handler option
$guzzle = new GuzzleClient(['handler' => $stack]);
$client = new Client($guzzle);
$logger = new NullLogger();

$feedIo = new \FeedIo\FeedIo($client, $logger);

As feeds' content may vary often, caching may result in unwanted behaviors.

You can inject any Logger you want as long as it implements Psr\Log\LoggerInterface. Monolog does, but it's the only library : https://packagist.org/providers/psr/log-implementation

use FeedIo\FeedIo;
use FeedIo\Adapter\Guzzle\Client;
use GuzzleHttp\Client as GuzzleClient;
use Custom\Logger;

$client = new Client(new GuzzleClient());
$logger = new Logger();

$feedIo = new FeedIo($client, $logger);

Warning : it is highly recommended to use the default Guzzle Client integration.

If you really want to use another library to read feeds, you need to create your own FeedIo\Adapter\ClientInterface class to embed interactions with the library :

use FeedIo\FeedIo;
use Custom\Adapter\Client;
use Library\Client as LibraryClient;
use Psr\Log\NullLogger;

$client = new Client(new LibraryClient());
$logger = new NullLogger();

$feedIo = new FeedIo($client, $logger);

Choosing between using the Factory or build FeedIo without it is a question you must ask yourself at some point of your project. The Factory is mainly designed to let you use feed-io with the lesser efforts and get your first results in a small amount of time. However, it doesn't let you benefit of all Monolog's and Guzzle's features, which could be annoying. Dependency injection will also let you choose another library to handle logs if you need to.

Sometimes you have to consume feeds in which the timezone is missing from the dates. In some use-cases, you may need to specify the feed's timezone to get an accurate value, so feed-io offers a workaround for that :

$feedIo->getDateTimeBuilder()->setFeedTimezone(new \DateTimeZone($feedTimezone));
$result = $feedIo->read($feedUrl);
$feedIo->getDateTimeBuilder()->resetFeedTimezone();

Don't forget to reset feedTimezone after fetching the result, or you'll end up with all feeds located in the same timezone.

The whole documentation is available at https://feed-io.net