Build fast, concurrent applications with PHP

Benefit from concurrency by replacing your blocking I/O with non-blocking I/O,
or designing your system with non-blocking I/O from the ground up.

We shipped fibers in PHP 8.1 to extend its capabilities for concurrent applications.

The PHP standard library has already provided everything else we needed for years now, but it only ships the low-level building blocks. AMPHP provides higher-level libraries using non-blocking I/O under the hood. Fibers allow these libraries to just work, no matter whether they're used in concurrent or traditional contexts.

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Latest Releases

  • Released on 2025-08-31 2.3.2 on GitHub

    amphp/parallel 2.3.2

    What’s Changed

    • Use str_increment() to fix PHP 8.5 deprecation by @nicolas-grekas in https://github.com/amphp/parallel/pull/222
    • Add .github and psalm.xml to export-ignore by @savinmikhail in https://github.com/amphp/parallel/pull/210

    New Contributors

    • @savinmikhail made their first contribution in https://github.com/amphp/parallel/pull/210
    • @nicolas-grekas made their first contribution in https://github.com/amphp/parallel/pull/222

    Full Changelog: https://github.com/amphp/parallel/compare/v2.3.1…v2.3.2

  • Released on 2025-08-27 3.1.1 on GitHub

    amphp/amp 3.1.1

    What’s Changed

    • Improve weakClosure() signature by @vudaltsov in https://github.com/amphp/amp/pull/452
    • Use str_increment() to fix PHP 8.5 deprecation by @nicolas-grekas in https://github.com/amphp/amp/pull/456

    New Contributors

    • @vudaltsov made their first contribution in https://github.com/amphp/amp/pull/452

    Full Changelog: https://github.com/amphp/amp/compare/v3.1.0…v3.1.1

  • Released on 2025-08-27 2.1.1 on GitHub

    amphp/php-cs-fixer-config 2.1.1

    • Fix formatting of str_increment

    Full Changelog: https://github.com/amphp/php-cs-fixer-config/compare/v2.1.0…v2.1.1

  • Released on 2025-08-24 2.0.2 on GitHub

    amphp/websocket-client 2.0.2

    What’s Changed

    • Fix League\Uri\Http deprecation warning by @foxycode in https://github.com/amphp/websocket-client/pull/56

    Full Changelog: https://github.com/amphp/websocket-client/compare/v2.0.1…v2.0.2

  • Released on 2025-08-16 5.3.4 on GitHub

    amphp/http-client 5.3.4

    What’s Changed

    • Fixed an issue where an HTTP/2 connection was closed unexpectedly, on rare occasions an exception was being thrown to the event-loop error handler
    • Made an optimization when shutting down an HTTP/2 connection to only create an exception instance if there are outstanding requests on the connection.

    Full Changelog: https://github.com/amphp/http-client/compare/v5.3.3…v5.3.4

  • Released on 2025-06-26 1.1.3 on GitHub

    amphp/http-client-guzzle-adapter 1.1.3

    What’s Changed

    • Improved curl options check by @root-aza in https://github.com/amphp/http-client-guzzle-adapter/pull/4

    New Contributors

    • @root-aza made their first contribution in https://github.com/amphp/http-client-guzzle-adapter/pull/4

    Full Changelog: https://github.com/amphp/http-client-guzzle-adapter/compare/v1.1.2…v1.1.3

  • Released on 2025-06-07 2.0.3 on GitHub

    amphp/sql-common 2.0.3

    What’s Changed

    • Added a reference to $this in the returned Generator from SqlPooledResult::getIterator() to prevent destruction of the SqlPooledResult while the returned Generator object exists.

    Full Changelog: https://github.com/amphp/sql-common/compare/v2.0.2…v2.0.3

  • Released on 2025-05-18 3.4.3 on GitHub

    amphp/http-server 3.4.3

    What’s Changed

    • Avoid hanging requests in case a request body is closed prematurely by @danog in https://github.com/amphp/http-server/pull/380
    • Fix parsing of raw ipv6 address in host header by @luzrain in https://github.com/amphp/http-server/pull/378

    New Contributors

    • @danog made their first contribution in https://github.com/amphp/http-server/pull/380

    Full Changelog: https://github.com/amphp/http-server/compare/v3.4.2…v3.4.3

  • Released on 2025-03-16 2.1.2 on GitHub

    amphp/byte-stream 2.1.2

    • Fixed the exception type thrown if ReadableIterableStream is closed (Amp\Pipeline\DisposedException was leaked, now an Amp\ByteStream\ClosedException is thrown).

    Full Changelog: https://github.com/amphp/byte-stream/compare/v2.1.1…v2.1.2

  • Released on 2025-03-16 1.2.3 on GitHub

    amphp/pipeline 1.2.3

    • Fixed failing any pending value consumption when a Queue is disposed (regression in 1.2.2).

    Full Changelog: https://github.com/amphp/pipeline/compare/v1.2.2…v1.2.3

  • Released on 2025-02-12 2.0.0 on GitHub

    amphp/http-tunnel 2.0.0

    Stable release compatible with AMPHP v3 and fibers! 🎉

    As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

    This library provides an implementation of Amp\Socket\SocketConnector from amphp/socket which establishes a socket connection via an HTTP/1.1 CONNECT request to a proxy.

  • Released on 2025-01-19 2.4.0 on GitHub

    amphp/dns 2.4.0

    What’s Changed

    • Replaced WMIC nameserver lookup with PowerShell equivalent by @Bilge in https://github.com/amphp/dns/pull/116

    Full Changelog: https://github.com/amphp/dns/compare/v2.3.0…v2.4.0

  • Released on 2025-01-15 2.0.3 on GitHub

    amphp/redis 2.0.3

    What’s Changed

    Full Changelog: https://github.com/amphp/redis/compare/v2.0.2…v2.0.3

  • Released on 2024-12-21 2.0.1 on GitHub

    amphp/cluster 2.0.1

    What’s Changed

    • Report ExitFailures from cluster worker exits by @bwoebi in https://github.com/amphp/cluster/pull/21

    New Contributors

    • @bwoebi made their first contribution in https://github.com/amphp/cluster/pull/21

    Full Changelog: https://github.com/amphp/cluster/compare/v2.0.0…v2.0.1

  • Released on 2024-12-10 3.2.0 on GitHub

    amphp/file 3.2.0

    What’s Changed

    • The parallel driver no longer reuses the global worker pool if a specific instance is not provided to the constructor. Instead, a new worker pool is created.
    • The $workerLimit parameter to the constructor of ParallelFilesystemDriver is now deprecated. Pass an instance of LimitedWorkerPool instead.

    Full Changelog: https://github.com/amphp/file/compare/v3.1.1…v3.2.0

  • Released on 2024-11-23 2.0.1 on GitHub

    amphp/sql 2.0.1

    What’s Changed

    • Added PHP 8.4 compatibility by @Bilge in https://github.com/amphp/sql/pull/9

    New Contributors

    • @Bilge made their first contribution in https://github.com/amphp/sql/pull/9

    Full Changelog: https://github.com/amphp/sql/compare/v2.0.0…v2.0.1

  • Released on 2024-11-23 2.1.2 on GitHub

    amphp/http 2.1.2

    What’s Changed

    • Added support for PHP 8.4 by @Bilge in https://github.com/amphp/http/pull/29

    Full Changelog: https://github.com/amphp/http/compare/v2.1.1…v2.1.2

  • Released on 2024-11-22 2.1.1 on GitHub

    amphp/postgres 2.1.1

    What’s Changed

    • Fixed handling of int2vector and oidvector fields when using ext-pgsql (#68).
    • The type table is now loaded using an async query when using ext-pgsql. This query is only executed once per server upon the initial connection to that server. Using an async query will reduce latency when connecting to different Postgres servers.
    • Improved performance of array parsing when using ext-pgsql.

    Full Changelog: https://github.com/amphp/postgres/compare/v2.1.0…v2.1.1

  • Released on 2024-11-15 1.1.1 on GitHub

    amphp/http-client-psr7 1.1.1

    What’s Changed

    • Fixed support for PSR-7 requests with a protocol version of "2.0" by converting the protocol version to "2" when converting to an Amp\Http\Client\Request (#15).

    Full Changelog: https://github.com/amphp/http-client-psr7/compare/v1.1.0…v1.1.1

  • Released on 2024-10-28 2.0.4 on GitHub

    amphp/websocket 2.0.4

    What’s Changed

    • Fixed assertion failure when interleaving control frames between continuation frames in Rfc6455FrameCompiler.

    Full Changelog: https://github.com/amphp/websocket/compare/v2.0.3…v2.0.4

  • Released on 2024-08-04 2.3.0 on GitHub

    amphp/sync 2.3.0

    What’s Changed

    • Fixed posix semaphore blocking thread when there is no space left on device by @azjezz in https://github.com/amphp/sync/pull/29
    • Added a buffer size parameter to createChannelPair() to specify a number of items which may be buffered in memory before back pressure is applied.

    New Contributors

    • @azjezz made their first contribution in https://github.com/amphp/sync/pull/29

    Full Changelog: https://github.com/amphp/sync/compare/v2.2.0…v2.3.0

  • Released on 2024-04-21 2.3.1 on GitHub

    amphp/socket 2.3.1

    What’s Changed

    • Make implicit nullable types explicit to avoid deprecation notice in PHP 8.4.

    Full Changelog: https://github.com/amphp/socket/compare/v2.3.0…v2.3.1

  • Released on 2024-04-19 2.0.1 on GitHub

    amphp/cache 2.0.1

    What’s Changed

    • Make implicit nullable types explicit to avoid deprecation notice in PHP 8.4.

    Full Changelog: https://github.com/amphp/cache/compare/v2.0.0…v2.0.1

  • Released on 2024-04-19 2.0.3 on GitHub

    amphp/process 2.0.3

    What’s Changed

    • Make implicit nullable types explicit to avoid deprecation notice in PHP 8.4.

    Full Changelog: https://github.com/amphp/process/compare/v2.0.2…v2.0.3

  • Released on 2024-03-21 1.1.1 on GitHub

    amphp/parser 1.1.1

    What’s Changed

    • Make implicit nullable types explicit by @nicolas-grekas in https://github.com/amphp/parser/pull/6

    New Contributors

    • @nicolas-grekas made their first contribution in https://github.com/amphp/parser/pull/6

    Full Changelog: https://github.com/amphp/parser/compare/v1.1.0…v1.1.1

  • Released on 2024-03-21 3.2.1 on GitHub

    amphp/hpack 3.2.1

    What’s Changed

    • Make implicit nullable types explicit by @nicolas-grekas in https://github.com/amphp/hpack/pull/16

    Full Changelog: https://github.com/amphp/hpack/compare/v3.2.0…v3.2.1

  • Released on 2024-03-19 2.0.0 on GitHub

    amphp/rpc 2.0.0

    Stable release compatible with AMPHP v3 and fibers! 🎉

    As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

  • Released on 2024-03-10 3.0.0 on GitHub

    amphp/mysql 3.0.0

    Stable release compatible with AMPHP v3 and fibers! 🎉

    As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

    • Classes and interfaces now are prefixed with Mysql to avoid collisions with similar names from other libraries.
    • Marked most classes as internal, leaving only interfaces and concrete implementations required to use the API or create a custom connector.
    • MysqlTransaction now extends MysqlLink instead of MysqlExecutor to support nested transactions.
    • MysqlDataType is now an enum of MySQL data type codes and methods to decode data based on type.
    • Result set field data is now available from MysqlResult::getColumnDefinitions() which returns an array of MysqlColumnDefinition objects corresponding to the result set rows.
    • The second param of MysqlStatement::bind() now requires a string. Binding only makes sense with long strings anyway.
    • MysqlConnection is now an interface extending SqlConnection, with SocketMysqlConnection being the implementation.
    • Removed MysqlConnector since the interface was replaced by template types on SqlConnector, i.e. SqlConnector<MysqlConfig, MysqlConnection>
  • Released on 2024-01-30 1.0.1 on GitHub

    amphp/windows-registry 1.0.1

    What’s Changed

    • Removed nullability from return type of WindowsRegistry::read(), the method throws if the key is not found.

    Full Changelog: https://github.com/amphp/windows-registry/compare/v1.0.0…v1.0.1

  • Released on 2023-12-29 4.0.0 on GitHub

    amphp/websocket-server 4.0.0

    The 4.0.0 release fixes compression support with a couple small compatibility breaks from 3.x.

    Users of 2.x should upgrade directly to 4.0.0.

    Users of 3.x can upgrade directly to 4.0.0 if compression is not being used. If a custom WebsocketAcceptor was created to support compression, this custom implementation may be dropped, instead passing an instance of WebsocketCompressionContextFactory to each Websocket request handler.

    Backward Compatibility Breaks

    • The WebsocketCompressionContextFactory constructor parameter of Rfc6455ClientFactory has been removed and is instead a constructor parameter of the Websocket class.
    • A nullable WebsocketCompressionContext parameter was added to WebsocketClientFactory::createClient().
  • Released on 2023-11-25 2.0.0 on GitHub

    amphp/parallel-functions 2.0.0

    Stable release compatible with AMPHP v3 and fibers! 🎉

    As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

  • Released on 2023-10-08 2.0.0 on GitHub

    amphp/http-client-cookies 2.0.0

    Stable release compatible with AMPHP v3 and fibers! 🎉

    As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

    • Renamed InMemoryCookieJar to LocalCookieJar
  • Released on 2023-08-25 2.0.0 on GitHub

    amphp/http-server-form-parser 2.0.0

    This release is compatible with amphp/http-server@^3.

    • Renamed BufferingParser and StreamingParser to FormParser and StreamingFormParser, respectively.
    • Removed the parseForm function in favor of the Form::fromRequest() static method.
    • Removed ParsingMiddleware. Use Form::fromRequest() instead.
    • Removed ParseException. Form parsing errors will throw an HttpErrorException from amphp/http-server instead, which do not need to be caught (the server will automatically return an error response).
  • Released on 2023-08-20 3.0.0 on GitHub

    amphp/http-server-session 3.0.0

    This release is compatible with amphp/http-server@^3.

    • Renamed Storage, InMemoryStorage, RedisStorage, DefaultIdGenerator, and Driver to SessionStorage, LocalSessionStorage, RedisSessionStorage, Base64UrlSessionIdGenerator, and SessionFactory, respectively
    • Renamed methods on Session: open() to lock(), save() to commit()
    • Added Session::rollback() to undo local changes and re-read the session data from storage
    • Added SessionTrainer for examining session changes unit testing
  • Released on 2023-08-20 2.0.0 on GitHub

    amphp/http-server-static-content 2.0.0

    This release is compatible with amphp/http-server@^3.

    • DocumentRoot now requires an instance of HttpServer and ErrorHandler to construct
    • Removed DocumentRoot::onStart() and DocumentRoot::onStop(), as it’s now internally registered
    • Removed support for ServerObserver, as it’s been removed from amphp/http-server
    • Added StaticResource to serve a single static file
  • Released on 2023-08-05 2.0.0 on GitHub

    amphp/http-server-router 2.0.0

    This release is compatible with amphp/http-server@^3.

    • A PSR-3 logger is now required in the Router constructor
    • Starting the server with an empty Router is now allowed and only logs a notice instead of throwing an exception
    • Middleware can be added via addMiddleware() instead of stack()
    • Removed support for adding middleware directly via addRoute(), use stackMiddleware() instead if you need this
    • Removed Router::onStart(), as it’s now internally registered
    • Removed support for ServerObserver, as it’s been removed from amphp/http-server
  • Released on 2023-08-05 2.0.0 on GitHub

    amphp/log 2.0.0

    • Increased minimum PHP version to 8.1
    • Make use of fibers with Amp v3 and Revolt
    • Added support for Monolog v3.x

    This release does not contain any changes in comparison to v2.0.0-beta.2.

  • Released on 2022-12-18 3.0.0 on GitHub

    amphp/phpunit-util 3.0.0

    This package has been redesigned for compatibility with AMPHP v3 and fibers. AsyncTestCase serves a similar purpose as before, providing helper methods for unit testing within an async context. Each test case is run within a unique fiber to allow suspending during the test run.

    • AsyncTestCase::setUpAsync() and tearDownAsync() have been removed. Use AsyncTestCase::setUp() and tearDown() instead, as both of these methods are now able to execute async using fibers.
    • AsyncTestCase::createCallback() now returns a Closure. Additionally, an optional parameter for expected arguments upon invocation have been added (uses InvocationMocker::with(...) to set expected arguments).
  • Released on 2020-11-18 0.3.2 on GitHub

    amphp/beanstalk 0.3.2

    • Added support for Symfony YAML library v4 and v5. (#34)
  • Released on 2020-03-28 1.0.0 on GitHub

    amphp/serialization 1.0.0

    Initial release.

  • Released on 2019-12-21 1.0.0 on GitHub

    amphp/http-client-cache 1.0.0

    Initial release.

  • Released on 2019-11-04 2.1.0 on GitHub

    amphp/react-adapter 2.1.0

    • React\EventLoop\Factory is now automatically replaced with another implementation that throws on each usage to prevent two loops existing concurrently by accident. Set AMP_REACT_ADAPTER_DISABLE_FACTORY_OVERRIDE=1 as environment variable or constant to disable this protection.
  • Released on 2018-03-07 0.1.0 on GitHub

    amphp/react-stream-adapter 0.1.0

    Initial release.