Fix bug #66719

While parent:: should inherit the called scope, it should only do
so if it is compatible. If there is no called scope, or it is not
a subtype of the scope, we should fall back to the scope.

NEWS

@@ -4,6 +4,8 @@ PHP                                                                        NEWS
 
 - Core:
   . Fixed bug #72595 (php_output_handler_append illegal write access). (cmb)
+  . Fixed bug #66719 (Weird behaviour when using get_called_class() with
+    call_user_func()). (Nikita)
 
 - BCMath:
   . Fixed bug #78238 (BCMath returns "-0"). (cmb)

Zend/tests/bug66719.phpt

@@ -0,0 +1,43 @@
+--TEST--
+Bug #66719: Weird behaviour when using get_called_class() with call_user_func()
+--FILE--
+<?php
+
+class A
+{
+    public static function who()
+    {
+        var_dump(get_called_class());
+    }
+}
+class B extends A
+{
+    public static function who()
+    {
+        parent::who();
+    }
+}
+
+class C
+{
+    public static function test() {
+        B::who();
+        call_user_func(array(A::class, 'who'));
+        call_user_func(array(B::class, 'parent::who'));
+    }
+}
+
+B::who();
+call_user_func(array(A::class, 'who'));
+call_user_func(array(B::class, 'parent::who'));
+
+C::test();
+
+?>
+--EXPECT--
+string(1) "B"
+string(1) "A"
+string(1) "A"
+string(1) "B"
+string(1) "A"
+string(1) "A"

Zend/zend_API.c

@@ -2922,6 +2922,9 @@ static int zend_is_callable_check_class(zend_string *name, zend_class_entry *sco
 			if (error) *error = estrdup("cannot access self:: when no class scope is active");
 		} else {
 			fcc->called_scope = zend_get_called_scope(EG(current_execute_data));
+			if (!fcc->called_scope || !instanceof_function(fcc->called_scope, scope)) {
+				fcc->called_scope = scope;
+			}
 			fcc->calling_scope = scope;
 			if (!fcc->object) {
 				fcc->object = zend_get_this_object(EG(current_execute_data));
@@ -2935,6 +2938,9 @@ static int zend_is_callable_check_class(zend_string *name, zend_class_entry *sco
 			if (error) *error = estrdup("cannot access parent:: when current class scope has no parent");
 		} else {
 			fcc->called_scope = zend_get_called_scope(EG(current_execute_data));
+			if (!fcc->called_scope || !instanceof_function(fcc->called_scope, scope->parent)) {
+				fcc->called_scope = scope->parent;
+			}
 			fcc->calling_scope = scope->parent;
 			if (!fcc->object) {
 				fcc->object = zend_get_this_object(EG(current_execute_data));