This changelog references the relevant changes (bug and security fixes) done in 2.3 minor versions.
To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v2.3.0...v2.3.1
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2.3.3 (2013-08-07)
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c35cc5b: added trusted hosts check
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6d555bc: Fixed metadata serialization
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cd51d82: [Form] fixed wrong call to setTimeZone() (closes #8644)
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5c359a8: Fix issue with \DateTimeZone::UTC / 'UTC' for PHP 5.4
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85330a6: [Form] Fixed patched forms to be valid even if children are not submitted
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cb5e765: [Form] Fixed: If a form is not present in a request, it is not automatically submitted
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97cbb19: [Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser
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c138304: [routing] added ability for apache matcher to handle array values
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1bd45b3: [FrameworkBundle] fixed regression where the command might have the wrong container if the application is reused several times
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b41cf82: [Validator] fixed StaticMethodLoader trying to invoke methods of abstract classes (closes #8589)
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e5fba3c: [Form] fixes empty file-inputs get treated as extra field
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3553c71: return 0 if there is no valid data
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50d0727: [DependencyInjection] fixed regression where setting a service to null did not trigger a re-creation of the service when getting it
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dc1fff0: The ignoreAttributes itself should be ignored, too.
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ae7fa11: [Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes #8546)
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28e0709: [Validator] fixed ConstraintViolation:: incorrect when nested
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890934d: handle Optional and Required constraints from XML or YAML sources correctly
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a2eca45: Fixed #8455: PhpExecutableFinder::find() does not always return the correct binary
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485d53a: [DependencyInjection] Fix Container::camelize to convert beginning and ending chars
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2317443: [Security] fixed issue where authentication listeners clear unrelated tokens
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2ebb783: fix issue #8499 modelChoiceList call getPrimaryKey on a non object
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242b318: [DependencyInjection] Add exception for service name not dumpable in PHP
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d3eb9b7: [Validator] Fixed groups argument misplace for validateValue method from validator class
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2.3.2 (2013-07-17)
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bb59f40: Reverts JSON_NUMERIC_CHECK
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9c5f8c6: [Yaml] removed wrong comment removal inside a string block
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2dc1ee0: [HtppKernel] fixed inline fragment renderer
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06b69b8: fixed inline fragment renderer
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91bb757: ProgressHelper shows percentage complete.
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9d1004b: fix handling of a default 'template' as a string
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82dbaee: [HttpKernel] fixed the inline renderer when passing objects as attributes (closes #7124)
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8bb4e4d: [DI] Fixed bug requesting non existing service from dumped frozen container
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6dbd1e1: [WebProfiler] fix content-type parameter
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a830001: Passed the config when building the Configuration in ConfigurableExtension
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c875d0a: [Form] fixed INF usage which does not work on Solaris (closes #8246)
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ab1439e: [Console] Fixed the table rendering with multi-byte strings.
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c0da3ae: [Process] Disable exception on stream_select timeout
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77f2aa8: [HttpFoundation] fixed issue with session_regenerate_id (closes #7380)
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bcbbb28: Throw exception if value is passed to VALUE_NONE input, long syntax
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6b71513: fixed date type format pattern regex
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b5ded81: [Security] fixed usage of the salt for the bcrypt encoder (refs #8210)
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842f3fa: do not re-register commands each time a Console\Application is run
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0991cd0: [Process] moved env check to the Process class (refs #8227)
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8764944: fix issue where $_ENV contains array vals
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4139936: [DomCrawler] Fix handling file:// without a host
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e65723c: fix-progressbar-start
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aa79393: also consider alias in Container::has()
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de289d2: [Form] corrected interface bind() method defined against in deprecation notice
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0c0a3e9: [Console] fixed regression when calling a command foo:bar if there is another one like foo:bar:baz (closes #8245)
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849f3ed: [Finder] Fix SplFileInfo::getContents isn't working with ssh2 protocol
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6d2135b: force the Content-Type to html in the web profiler controllers
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2.3.1 (2013-06-11)
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25e3abd: fix many-to-many Propel1 ModelChoiceList
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bce6bd2: [DomCrawler] Fixed a fatal error when setting a value in a malformed field name.
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e3561ce: [FrameworkBundle] Fixed OutOfBoundException when session handler_id is null
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81b122d: [DependencyInjection] Add support for aliases of aliases + regression test
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445b2e3: [Console] fix status code when Exception::getCode returns something like 0.1
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bbfde62: Fixed exit code for exceptions with error code 0
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d8c0ef7: [DependencyInjection] Rename ContainerBuilder::$aliases to avoid conflicting with the parent class
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bb797ee: [DependencyInjection] Remove getAliasService methods from compiled containers
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379f5e0: [DependencyInjection] Fix aliased access of shared services, fixes #8096
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afad9c7: instantiate valid commands only
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2.3.0 (2013-06-03)
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e93fc7a: [FrameworkBundle] set the dispatcher in the console application
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2038329: [Form] [Validator] Fixed post_max_size = 0 bug (Issue #8065)
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554ab9f: [Console] renamed ConsoleForExceptionEvent into ConsoleExceptionEvent
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fd151fd: [Security] Fixed the check if an interface exists.
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c8e5503: [FrameworkBundle] removed HttpFoundation classes from HttpKernel cache
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169c0b9: [Finder] Fix iteration fails with non-rewindable streams
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45b68e0: [Finder] Fix unexpected duplicate sub path related AppendIterator issue
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13ba4ea: fix logger in regards to DebugLoggerInterface
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97b38ed: Added type of return value in VoterInterface.
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79a842a: [Console] Add namespace support back in to list command
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5321600: Fixed two bugs in HttpCache
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435012f: [Config] Adding the previous exception message into the FileLoaderLoadException so it's more easily seen
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5c317b7: [Console] fix and refactor exit code handling
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1469953: [CssSelector] Fix :nth-last-child() translation
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2d9027d: [CssSelector] Fix :nth-last-child() translation
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91b8490: Fix Crawler::children() to not trigger a notice for childless node
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2.3.0-RC1 (2013-05-16)
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95f356b: remove check for PHP bug #50731
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8f54da7: [BrowserKit] should not follow redirects if status code is not 30x
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f41ac06: changed all version deps to accepts all upcoming Symfony versions
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a4e3ebf: [DomCrawler] Fixed the Crawler::html() method for PHP versions earlier than 5.3.6.
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3beaf52: [Security] Disabled the BCryptPasswordEncoder tests for PHP versions lower than 5.3.7.
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2.3.0-BETA2 (2013-05-10)
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97bee20: Pass exceptions from the ExceptionListener to Monolog
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be42dbc: [HttpFoundation][File][UploadedFile] Fix guessClientExtension() method
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a5441b2: Fixed parsing of leading blank lines in folded scalars. Closes #7989.
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e8d5d16: Fixed Loader import
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bd0c48c: [Console] moved the IO configuration to its own method
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fdb4b1f: [Console] moved --help support to allow proper behavior with other passed options
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dd0e138: Eased translationNodeVisitor overriding in TranslationExtension
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853f681: fixed request scope issues (refs #7457)
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60edc58: Fixed fatal error in normalize/denormalizeObject.
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78e3710: ProxyManager Bridge
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41805c0: [Crawler] Add proper validation of node argument of method add
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7933971: [Form] Added radio button for empty value to expanded single-choice fields
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0586c7e: made some optimization when parsing YAML files
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1856df3: [Security] fixed wrong merge (refs #4776)
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5b7e1e6: added a missing check for the provider key
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f1c2ab7: [DependencyInjection] Add a method map to avoid computing method names from service names
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ea633f5: [HttpKernel] Avoid updating the context if the request did not change
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997d549: [HttpFoundation] Avoid a few unnecessary str_replace() calls
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f5e7f24: [HttpFoundation] Optimize ServerBag::getHeaders()
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59b78c7: [Validator] Fixed: $traverse and $deep is passed to the visitor from Validator::validate()
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bcb5400: [Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions
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7b2ebbf: [Form] Fixed: String validation groups are never interpreted as callbacks
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0610750: if the repository method returns an array ensure that it's internal poin...
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dcced01: [Form] Improved multi-byte handling of NumberToLocalizedStringTransformer
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90a20d7: [Translation] Made translation domain defaults in Translator consistent with TranslatorInterface
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549a308: [Form] Fixed CSRF error messages to be translated and added "csrf_message" option