Implemented FR #78638 (__PHP_Incomplete_Class should be final)

This should be minor and won't impact anyone

Author: laruence

NEWS

@@ -83,6 +83,7 @@ PHP                                                                        NEWS
   . Added SQLite3::setAuthorizer() and respective class constants. (bohwaz)
 
 - Standard:
+  . Implemented FR #78638 (__PHP_Incomplete_Class should be final). (Laruence)
   . Fixed bug #77204 (getimagesize(): Read error! should mention file path).
     (peter279k)
   . Fixed bug #76859 (stream_get_line skips data if used with data-generating

ext/standard/incomplete_class.c

@@ -108,9 +108,10 @@ static zend_object *php_create_incomplete_object(zend_class_entry *class_type)
 
 PHPAPI zend_class_entry *php_create_incomplete_class(void)
 {
-	zend_class_entry incomplete_class;
+	zend_class_entry incomplete_class, *incomplete_class_entry;
 
 	INIT_CLASS_ENTRY(incomplete_class, INCOMPLETE_CLASS, NULL);
+
 	incomplete_class.create_object = php_create_incomplete_object;
 
 	memcpy(&php_incomplete_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
@@ -121,7 +122,10 @@ PHPAPI zend_class_entry *php_create_incomplete_class(void)
 	php_incomplete_object_handlers.get_property_ptr_ptr = incomplete_class_get_property_ptr_ptr;
     php_incomplete_object_handlers.get_method = incomplete_class_get_method;
 
-	return zend_register_internal_class(&incomplete_class);
+	incomplete_class_entry = zend_register_internal_class(&incomplete_class);
+	incomplete_class_entry->ce_flags |= ZEND_ACC_FINAL;
+
+	return incomplete_class_entry;
 }
 /* }}} */
 

ext/standard/tests/class_object/bug78638.phpt

@@ -0,0 +1,9 @@
+--TEST--
+FR: #78638 (__PHP_Incomplete_Class should be final)
+--FILE--
+<?php
+$c = new class('bar') extends __PHP_Incomplete_Class {
+};
+?>
+--EXPECTF--
+Fatal error: Class class@anonymous may not inherit from final class (__PHP_Incomplete_Class) in %sbug78638.php on line %d