Merge pull request #5697 from ahinkle/patch-2

[6.x] Validation Rules exclude_if, exclude_unless

validation.md

@@ -596,6 +596,8 @@ Below is a list of all available validation rules and their function:
 [Distinct](#rule-distinct)
 [E-Mail](#rule-email)
 [Ends With](#rule-ends-with)
+[Exclude If](#rule-exclude_if)
+[Exclude Unless](#rule-exclude_unless)
 [Exists (Database)](#rule-exists)
 [File](#rule-file)
 [Filled](#rule-filled)
@@ -800,6 +802,16 @@ The `filter` validator, which uses PHP's `filter_var` function under the hood, s
 
 The field under validation must end with one of the given values.
 
+<a name="rule-exclude-if"></a>
+#### exclude_if:_anotherfield_,_value_
+
+The field under validation will be excluded from the request data returned by the `validate` and `validated` methods if the _anotherfield_ field is equal to _value_.
+
+<a name="rule-exclude-unless"></a>
+#### exclude_unless:_anotherfield_,_value_
+
+The field under validation will be excluded from the request data returned by the `validate` and `validated` methods unless _anotherfield_'s field is equal to _value_.
+
 <a name="rule-exists"></a>
 #### exists:_table_,_column_