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Commitce58ee9

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Added rules for adding parent interfaces and moving methods/properties to parent interfaces/classes
1 parentbe2251c commitce58ee9

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‎contributing/code/bc.rst‎

Lines changed: 27 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@ Our Backwards Compatibility Promise
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Ensuring smooth upgrades of your projects is our first priority. That's why
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we promise you backwards compatibility (BC) for all minor Symfony releases.
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You probably recognize this strategy as `Semantic Versioning`_. In short,
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You probably recognize this strategy as `Semantic Versioning`_. In short,
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Semantic Versioning means that only major releases (such as 2.0, 3.0 etc.) are
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allowed to break backwards compatibility. Minor releases (such as 2.5, 2.6 etc.)
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may introduce new features, but must do so without breaking the existing API of
@@ -211,21 +211,22 @@ Type of Change Regular API
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============================================== ============== ==============
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Remove entirely No No
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Change name or namespace No No
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Add parent interface Yes [2]_No
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Add parent interface Yes [2]_Yes [3]_
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Remove parent interface No No
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**Methods**
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Add method Yes [2]_ No
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Remove method No No
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Change name No No
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Move to parent interface Yes Yes
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Add argument without a default value No No
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Add argument with a default value Yes [2]_ No
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Remove argument Yes [3]_ Yes [3]_
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Remove argument Yes [4]_ Yes [4]_
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Add default value to an argument Yes [2]_ No
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Remove default value of an argument No No
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Add type hint to an argument No No
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Remove type hint of an argument Yes [2]_ No
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Change argument type Yes [2]_ [4]_ No
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Change return type Yes [2]_ [5]_ No
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Change argument type Yes [2]_ [5]_ No
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Change return type Yes [2]_ [6]_ No
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============================================== ============== ==============
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Changing Classes
@@ -241,17 +242,19 @@ Remove entirely No No
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Make final Yes [2]_ No
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Make abstract No No
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Change name or namespace No No
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Change parent class Yes [6]_ Yes [6]_
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Change parent class Yes [7]_ Yes [7]_
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Add interface Yes Yes
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Remove interface No No
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**Public Properties**
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Add public property Yes Yes
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Remove public property No No
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Reduce visibility No No
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Move to parent class Yes Yes
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**Protected Properties**
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Add protected property Yes Yes
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Remove protected property Yes [2]_ No
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Reduce visibility Yes [2]_ No
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Move to parent class Yes Yes
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**Private Properties**
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Add private property Yes Yes
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Remove private property Yes Yes
@@ -260,34 +263,37 @@ Add constructor without mandatory arguments Yes [2]_ Yes [2]_
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Remove constructor Yes [2]_ No
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Reduce visibility of a public constructor No No
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Reduce visibility of a protected constructor Yes [2]_ No
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Move to parent class Yes Yes
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**Public Methods**
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Add public method Yes Yes
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Remove public method No No
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Change name No No
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Reduce visibility No No
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Move to parent class Yes Yes
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Add argument without a default value No No
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Add argument with a default value Yes [2]_ No
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Remove argument Yes [3]_ Yes [3]_
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Remove argument Yes [4]_ Yes [4]_
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Add default value to an argument Yes [2]_ No
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Remove default value of an argument No No
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Add type hint to an argument Yes [7]_ No
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Add type hint to an argument Yes [8]_ No
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Remove type hint of an argument Yes [2]_ No
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Change argument type Yes [2]_ [4]_ No
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Change return type Yes [2]_ [5]_ No
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Change argument type Yes [2]_ [5]_ No
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Change return type Yes [2]_ [6]_ No
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**Protected Methods**
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Add protected method Yes Yes
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Remove protected method Yes [2]_ No
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Change name No No
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Reduce visibility Yes [2]_ No
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Move to parent class Yes Yes
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Add argument without a default value Yes [2]_ No
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Add argument with a default value Yes [2]_ No
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Remove argument Yes [3]_ Yes [3]_
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Remove argument Yes [4]_ Yes [4]_
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Add default value to an argument Yes [2]_ No
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Remove default value of an argument Yes [2]_ No
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Add type hint to an argument Yes [2]_ No
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Remove type hint of an argument Yes [2]_ No
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Change argument type Yes [2]_ [4]_ No
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Change return type Yes [2]_ [5]_ No
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Change argument type Yes [2]_ [5]_ No
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Change return type Yes [2]_ [6]_ No
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**Private Methods**
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Add private method Yes Yes
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Remove private method Yes Yes
@@ -310,10 +316,13 @@ Change return type Yes Yes
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.. [2]Should be avoided. When done, this change must be documented in the
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UPGRADE file.
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.. [3]Only the last argument(s) of a method may be removed, as PHP does not
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.. [3]The added parent interface must not introduce any new methods that don't
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exist in the interface already.
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.. [4]Only the last argument(s) of a method may be removed, as PHP does not
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care about additional arguments that you pass to a method.
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.. [4]The argument type may only be changed to a compatible or less specific
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.. [5]The argument type may only be changed to a compatible or less specific
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type. The following type changes are allowed:
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=================== ==================================================================
@@ -327,7 +336,7 @@ Change return type Yes Yes
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interface ``<I>`` any superinterface of ``<I>``
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=================== ==================================================================
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.. [5]The return type may only be changed to a compatible or more specific
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.. [6]The return type may only be changed to a compatible or more specific
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type. The following type changes are allowed:
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=================== ==================================================================
@@ -345,10 +354,10 @@ Change return type Yes Yes
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interface ``<I>`` any subinterface or implementing class of ``<I>``
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=================== ==================================================================
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.. [6]When changing the parent class, the original parent class must remain an
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.. [7]When changing the parent class, the original parent class must remain an
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ancestor of the class.
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.. [7]A type hint may only be added if passing a value with a different type
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.. [8]A type hint may only be added if passing a value with a different type
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previously generated a fatal error.
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.. _Semantic Versioning:http://semver.org/

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