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Added: Some breaking changes to unsafe operations are documented in the UPGRADE file
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‎contributing/code/bc.rst

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@@ -57,7 +57,7 @@ Operation Normal API
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Type hint against Safe Safe
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Use method Safe Safe
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**When Implementing**
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Implement method Not Safe Safe
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Implement method Not Safe [1]_ Safe
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Add custom method Not Safe Not Safe
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Add custom method parameter Not Safe Not Safe
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Add parameter default value Safe Safe
@@ -75,20 +75,20 @@ Type of Change Normal 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 [1]_ No
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Add parent interface Yes [2]_ No
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Remove parent interface No No
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**Methods**
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Add method Yes [1]_ No
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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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Add parameter without a default value No No
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Add parameter with a default value Yes [1]_ No
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Remove parameter Yes [2]_ Yes [2]_
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Add default value to a parameter Yes [1]_ No
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Add parameter with a default value Yes [2]_ No
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Remove parameter Yes [3]_ Yes [3]_
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Add default value to a parameter Yes [2]_ No
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Remove default value of a parameter No No
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Add type hint to a parameter No No
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Remove type hint of a parameter Yes [1]_ No
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Change return type Yes [1]_ [3]_ No
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Remove type hint of a parameter Yes [2]_ No
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Change return type Yes [2]_ [4]_ No
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============================================== ============== ==============
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@@ -148,12 +148,12 @@ Extend Safe Safe
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Use public property Safe Safe
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Use public method Safe Safe
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**When Extending**
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Use protected property Not Safe Safe
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Use protected method Not Safe Safe
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Use protected property Not Safe [1]_ Safe
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Use protected method Not Safe [1]_ Safe
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Override public property Safe Safe
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Override protected property Not Safe Safe
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Override public method Not Safe Safe
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Override protected method Not Safe Safe
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Override protected property Not Safe [1]_ Safe
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Override public method Not Safe [1]_ Safe
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Override protected method Not Safe [1]_ Safe
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Add custom method Not Safe Not Safe
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Add custom method parameter Not Safe Not Safe
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Add parameter default value Safe Safe
@@ -170,10 +170,10 @@ code of Symfony's classes
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Type of Change Normal API
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================================================== ============== ==============
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Remove entirely No No
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Make final Yes [1]_ 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 [4]_ Yes [4]_
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Change parent class Yes [5]_ Yes [5]_
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Add interface Yes Yes
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Remove interface No No
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**Public Properties**
@@ -182,48 +182,51 @@ Remove public property No No
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Reduce visibility No No
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**Protected Properties**
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Add protected property Yes Yes
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Remove protected property Yes [1]_ No
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Reduce visibility Yes [1]_ No
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Remove protected property Yes [2]_ No
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Reduce visibility Yes [2]_ No
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**Constructors**
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Add constructor without mandatory parameters Yes [1]_ Yes [1]_
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Remove constructor Yes [1]_ No
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Add constructor without mandatory parameters 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 [1]_ No
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Reduce visibility of a protected constructor Yes [2]_ No
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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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Add parameter without a default value No No
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Add parameter with a default value Yes [1]_ No
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Remove parameter Yes [2]_ Yes [2]_
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Add default value to a parameter Yes [1]_ No
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Add parameter with a default value Yes [2]_ No
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Remove parameter Yes [3]_ Yes [3]_
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Add default value to a parameter Yes [2]_ No
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Remove default value of a parameter No No
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Add type hint to a parameter Yes [5]_ No
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Remove type hint of a parameter Yes [1]_ No
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Change return type Yes [1]_ [3]_ No
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Add type hint to a parameter Yes [6]_ No
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Remove type hint of a parameter Yes [2]_ No
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Change return type Yes [2]_ [4]_ No
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**Protected Methods**
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Add protected method Yes Yes
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Remove protected method Yes [1]_ No
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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 [1]_ No
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Add parameter without a default value Yes [1]_ No
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Add parameter with a default value Yes [1]_ No
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Remove parameter Yes [2]_ Yes [2]_
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Add default value to a parameter Yes [1]_ No
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Remove default value of a parameter Yes [1]_ No
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Add type hint to a parameter Yes [1]_ No
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Remove type hint of a parameter Yes [1]_ No
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Change return type Yes [1]_ [3]_ No
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Reduce visibility Yes [2]_ No
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Add parameter without a default value Yes [2]_ No
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Add parameter with a default value Yes [2]_ No
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Remove parameter Yes [3]_ Yes [3]_
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Add default value to a parameter Yes [2]_ No
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Remove default value of a parameter Yes [2]_ No
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Add type hint to a parameter Yes [2]_ No
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Remove type hint of a parameter Yes [2]_ No
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Change return type Yes [2]_ [4]_ No
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================================================== ============== ==============
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.. [1] Should be avoided. When done, this change must be documented in the
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.. [1] Your code may be broken by changes in the Symfony code. Such changes will
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however be documented in the UPGRADE file.
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.. [2] Should be avoided. When done, this change must be documented in the
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UGPRADE file.
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.. [2] Only the last parameter(s) of a method may be removed.
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.. [3] Only the last parameter(s) of a method may be removed.
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.. [3] The return type may only be changed to compatible types. The following
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.. [4] The return type may only be changed to compatible types. The following
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type changes are allowed:
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=================== ==================================================================
@@ -239,10 +242,10 @@ Change return type Yes [1]_ [3]_ No
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``Countable`` array
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=================== ==================================================================
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.. [4] When changing the parent class, the original parent class must remain an
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.. [5] When changing the parent class, the original parent class must remain an
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ancestor of the class.
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.. [5] A type hint may only be added if passing a value with a different type
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.. [6] 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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.. _scalar type: http://php.net/manual/en/function.is-scalar.php

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