Fix the return type of AppendIterator::getIteratorIndex()

Author: kocsismate

ext/spl/spl_iterators.stub.php

@@ -304,7 +304,7 @@ public function current(): mixed {}
     public function next(): void {}
 
     /** @tentative-return-type */
-    public function getIteratorIndex(): int {}
+    public function getIteratorIndex(): ?int {}
 
     /** @tentative-return-type */
     public function getArrayIterator(): ArrayIterator {}

ext/spl/spl_iterators_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: d69310bd3c6a7f8a0df41c2285af88711b1032f2 */
+ * Stub hash: 889a6eed2d62fbb6af168146840189d37765dbaa */
 
 ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_OBJ_INFO_EX(arginfo_class_EmptyIterator_current, 0, 0, never, 0)
 ZEND_END_ARG_INFO()
@@ -230,7 +230,8 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_class_AppendIterator_next arginfo_class_EmptyIterator_next
 
-#define arginfo_class_AppendIterator_getIteratorIndex arginfo_class_RecursiveIteratorIterator_getDepth
+ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_TYPE_INFO_EX(arginfo_class_AppendIterator_getIteratorIndex, 0, 0, IS_LONG, 1)
+ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_OBJ_INFO_EX(arginfo_class_AppendIterator_getArrayIterator, 0, 0, ArrayIterator, 0)
 ZEND_END_ARG_INFO()