Symfony 4.2 curated new features

New Components

• VarExporter, a component to serialize values to plain PHP code (nicolas-grekas) #28231
• symfony/contracts, a set of abstractions extracted out of the Symfony components (nicolas-grekas) #27093

Messenger

The messenger component is still marked as experimental in 4.2.

• Add a trait for synchronous query & command buses (ogizanagi) #29167
• make dispatch(), handle() and send() methods return Envelope (nicolas-grekas) #28983
• Add handled & sent stamps (ogizanagi) #29166
• remove AllowNoHandlerMiddleware in favor of a constructor argument on HandleMessageMiddleware (nicolas-grekas) #28945
• make Envelope first class citizen for middleware handlers (nicolas-grekas) #28914
• rename "envelope items" and move them in the "Stamp" namespace (nicolas-grekas) #28911
• Change AmqpExt classes constructor signature (fabpot) #28419
• Uses a messenger serializer, not an individual encoder/decoder (sroze) #28405
• Add a SenderLocator decoupled from ContainerInterface (fabpot) #28399
• Trace middleware execution in the profiler (ogizanagi) #27321
• Uses Symfony Serializer by default for envelope items (sroze) #28270
• Add a --bus option to the messenger:consume-messages command (chalasr, sroze) #28190
• Only subscribe to a given bus from the MessageSubscriber (sroze) #28275
• Support configuring messages when dispatching (ogizanagi) #26945

VarDumper

• add caster for Memcached (jschaedl) #28622
• add casters for IntlDateFormatter and IntlCalendar (jschaedl) #28566
• add caster for IntlTimeZone (jschaedl) #28559
• add caster for NumberFormatter (jschaedl) #28555
• add caster for MessageFormatter (nicolas-grekas) #28551
• Scroll into view when searching (ro0NL) #28854
• Allow to use a light theme out of the box (ogizanagi) #27261
• Allow dd() to be called without arguments (SjorsO) #28317
• New env var to select the dump format (dunglas) #25125
• make RedisCaster handle RedisCluster and dump all options on all drivers (nicolas-grekas) #28264
• display the signature of callables (nicolas-grekas) #27768

Cache

• Add stampede protection via probabilistic early expiration (nicolas-grekas) #27009
• add CacheInterface::delete() (nicolas-grekas) #28718
• added support for connecting to Redis clusters via DSN (nicolas-grekas) #28713
• support configuring multiple Memcached servers in one DSN (nicolas-grekas) #28598
• Add MarshallerInterface allowing to change the serializer, providing a default one that automatically uses igbinary when available (nicolas-grekas) #27645
• Allow configuring PDO-based cache pools, with table auto-creation on first use (nicolas-grekas) #27694
• added support for phpredis 4 compression and tcp_keepalive options (nicolas-grekas) #27646
• Use sub-second accuracy for internal expiry calculations (nicolas-grekas) #27031

Translation

• Added intl message formatter (aitboudad, Nyholm) #27399
• Use ICU parent locales as fallback locales (thewilkybarkid) #28070
• allow using the ICU message format using domains with the "+intl-icu" suffix (nicolas-grekas) #28952
• Added support for multiple files or directories in XliffLintCommand (yceruto) #28522
• Added support for translation files with other filename patterns (javiereguiluz) #27655
• marked getFallbackLocales() as internal (boscho87) #28626
• Register an identity translator as fallback (yceruto) #28523
• TranslationUpdate change default output to xlf (Alexis BOYER) #27935

WebProfilerBundle

• Add channel log filter (ro0NL) #28934
• Replay referer URL (ro0NL) #28936
• Extract server parameters into their own tab (fabpot) #28763
• Append new ajax request to the end of the list (BoShurik) #27763
• Show relative path of the template and improving panel view (yceruto) #27978
• Display uploaded files in the profiler (javiereguiluz) #26946

DotEnv

• Add a new loadForEnv() method mimicking Ruby's dotenv behavior (dunglas) #28533
• add a flag to allow env vars override (fmata) #26859

Serializer

• Refactor and uniformize the config by introducing a default context (dunglas) #28709
• allow configuring the serialized name of properties through metadata (fbourigault) #28505
• Add an option to skip null values (dunglas) #28661
• Add support for ignoring comments while XML encoding (maidmaid) #28289

Validator

• Deprecate checkMX and checkHost on Email validator (fabpot) #28842
• New DivisibleBy constraint for testing divisibility (colinodell) #28069
• Check the BIC country with symfony/intl (sylfabre) #28473
• Deprecate validating DateTimeInterface in Date/Time/DateTime constraints (ro0NL) #25015

Lock

• Add a PdoStore (jderusse) #27456
• Add Zookeeper data store (Ganesh Chandrasekaran) #27920
• Wrap release exception (jderusse) #28538
• Allow user to specify folder for flock (MaksSlesarenko) #26923

HttpKernel

• Deprecate usage of getRootDir() and kernel.root_dir (fabpot) #28810
• Deprecate the Kernel name (fabpot) #28809
• Turn HTTP exceptions to HTTP status codes by default (nicolas-grekas) #27519
• Better exception page when the controller returns nothing (lyrixx) #27138

Form

• Deprecate TimezoneType regions option (ro0NL) #28860
• allow additional HTTP methods in form configuration (alekitto) #26324
• Added options for separate date/time labels in DateTimeType. (mktcode) #21002
• Add ability to clear form errors (colinodell) #27580

Console

• Add support for error ouput in the CommandTester (cdekok) #27434
• Support max column width in Table (ro0NL) #28373
• Support formatted text cutting (ro0NL) #22225
• Add title table (maidmaid) #26933

OptionsResolver

• Added support for nesting options definition (yceruto) #27291
• Introduce ability to deprecate options, allowed types and values (yceruto) #27277

Process

• Add "wait until callback" feature to process class (Nek-) #27742
• Add relative path support for PHP_BINARY env var of PhpExecutableFinder (maidmaid) #28303
• deprecated defining commands as strings (nicolas-grekas) #27821

Security

• Add voter individual decisions to profiler (l-vo) #27914
• Add "is_granted()" to security expressions, deprecate "has_role()" (nicolas-grekas) #27305
• add port in access_control (roukmoute) #28061
• Deprecate simple_preauth and simple_form in favor of Guard (chalasr) #28693
• make remember-me cookies auto-secure + inherit their default config from framework.session.cookie_* (nicolas-grekas) #28446
• Remember me: allow to set the samesite cookie flag (dunglas) #27976
• No more support for custom anon/remember tokens based on FQCN (Iltar van der Berg) #26981

Finder

• Added a way to inverse a previous sorting (lyrixx) #27967
• Allow arrays as parameters of some methods for better fluent experience and code readability (jfredon) #27891
• added "use natural sort" option (vyshkant) #27024

DomCrawler

• Added new methods submitForm and clickLink to Client class (nowiko) #27807
• Add a way to filter direct children (Einenlum) #28221
• Allow using non-absolute base URIs (javiereguiluz) #28035

DependencyInjection

• Allow autowiring by type + parameter name (nicolas-grekas) #28234
• Allow autoconfiguring bindings (nicolas-grekas) #27806
• add ServiceSubscriberTrait (kbond) #27077
• Allow binding by type+name (nicolas-grekas) #27165

FrameworkBundle

• Add a new method AbstractController::addLink() (dunglas) #28875
• Add vscode editor to ide config (lexcast) #28679
• make debug:autowiring list useful services and their description (nicolas-grekas) #28970
• Deprecate Controller (sroze) #28243
• Added new "auto" mode for framework.session.cookie_secure to turn it on when https is used (nicolas-grekas) #28244
• Add SameSite cookies to FrameWorkBundle (rpkamp) #28168
• Add LoggerAwareInterface to auto configuration (GaryPEGEOT) #28176
• allow turning routes to utf8 mode by default (nicolas-grekas) #27774
• show public/private for aliases in debug:container command (OskarStark) #27551
• Allow configuring taggable cache pools (nicolas-grekas) #26934

Miscellaneous

• [Twig] Added template "name" argument to debug:twig command to find their paths (yceruto) #27981
• [Twig][Form] Add help_attr (mpiot) #27043
• [WebServerBundle] Added ability to display the current hostname address if available when binding to 0.0.0.0 (respinoza) #28586
• [Yaml] Added support for multiple files or directories in LintCommand (yceruto) #28521
• [HttpFoundation] Make ResponseHeaderBag::makeDisposition static (fabpot) #28807
• [HttpFoundation] make cookies auto-secure when passing them $secure=null + plan to make it and samesite=lax the defaults in 5.0 (nicolas-grekas) #28447
• [BrowserKit] Adds support for meta refresh (jhedstrom) #27118
• [LDAP] Add verbose ext-ldap error if present for easier debugging (scaytrase) #28424
• [LDAP] Add "applyOperations" method to EntryManager (mablae) #27069
• [Intl] Blacklist invalid languages (ro0NL) #28833
• [PropertyInfo] Implement "Collection" types in PhpDocExtractor (popy-dev) #26300
• [PropertyInfo] Add an extractor to guess if a property is initializable (dunglas) #26997
• [Routing] Add fallback to cultureless locale for internationalized routes (fancyweb) #27957
• [Doctrine] type guesser simple json array support (iluuu1994) #24297
• Added different protocols to be allowed as asset base_url (alexander-schranz) #28476
• Redesigned the default error page in production (javiereguiluz) #27699
• [ProxyManagerBridge] allow proxifying interfaces with "lazy: SomeProxifiedInterface" (nicolas-grekas) #27697
• [Config] deprecate tree builders without root nodes (xabbuh) #27476
• Display the log context in the debug pages (javiereguiluz) #24151
• CacheWarmerAggregate handle deprecations logs (ScullWM) #27421