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--- rfc:callable-interfaces [2016/04/06 11:58] – Adding question about instanceof usage ocramius
+++ rfc:callable-interfaces [2017/09/22 13:28] (current) – external edit 127.0.0.1
@@ Line 4: / Line 4: @@
   * Author: Ben Scholzen, mail@dasprids.de
   * Author: Marco Pivetta, ocramius@gmail.com
-  * Status: Draft
+  * Status: Retired
   * First Published at: http://wiki.php.net/rfc/callable-interfaces
@@ Line 112: / Line 112: @@
 ===== Still Open for Discussion =====
- * how will **instanceof** behave, when asked for a type-check against **callable**?
+How will **instanceof** behave, when asked for a type-check against **callable**?
+<code php>
+interface RegisterUser {
+    public function __invoke(Username $username) : UserRegistration;
+}
+interface DeleteUserRegistration {
+    public function __invoke(Username $username) : UserRegistration;
+}
+$register = function (Username $username) : UserRegistration {
+    return new UserRegistration(...);
+};
+var_dump($register instanceof DeleteUserRegistration); // true? false? possibly want to keep current semantics here.
+</code>
+===== Retired =====
+This RFC has been retired. Reason for that is that PHP currently (Version 7.0~7.1) allows applying function semantics to objects via the **_****_invoke** magic methods. Allowing the opposite would mix the domain of functions and objects in ways that are very hard to disentangle, and it would needlessly complicate the language semantics.
+While it is unfortunate that migration to type-safe callables (https://wiki.php.net/rfc/typesafe-callable) would require some interface rewrites, that is indeed the correct solution, as it keeps the uni-directionality between object and function semantics.
 ===== Backward Incompatible Changes =====

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