diff --git a/NEWS b/NEWS
index eea553c105135..8b8000311cdeb 100644
--- a/NEWS
+++ b/NEWS
@@ -25,6 +25,10 @@ PHP                                                                        NEWS
   . Invalid values now throw in Phar::mungServer() instead of being silently
     ignored. (nielsdos)
 
+- Reflection:
+  . Fixed bug GH-20217 (ReflectionClass::isIterable() incorrectly returns true
+    for classes with property hooks). (alexandre-daubois)
+
 - Standard:
   . Fixed bug GH-19926 (reset internal pointer earlier while splicing array
     while COW violation flag is still set). (alexandre-daubois)
diff --git a/ext/reflection/php_reflection.c b/ext/reflection/php_reflection.c
index a0c1b9f812430..a86ce16feb407 100644
--- a/ext/reflection/php_reflection.c
+++ b/ext/reflection/php_reflection.c
@@ -5589,7 +5589,8 @@ ZEND_METHOD(ReflectionClass, isIterable)
 		RETURN_FALSE;
 	}
 
-	RETURN_BOOL(ce->get_iterator || instanceof_function(ce, zend_ce_traversable));
+	RETURN_BOOL((ce->get_iterator && ce->get_iterator != zend_hooked_object_get_iterator)
+				|| instanceof_function(ce, zend_ce_traversable));
 }
 /* }}} */
 
diff --git a/ext/reflection/tests/ReflectionClass_isIterable_gh20217.phpt b/ext/reflection/tests/ReflectionClass_isIterable_gh20217.phpt
new file mode 100644
index 0000000000000..f64fc1efcd414
--- /dev/null
+++ b/ext/reflection/tests/ReflectionClass_isIterable_gh20217.phpt
@@ -0,0 +1,38 @@
+--TEST--
+GH-20217 (ReflectionClass::isIterable() should return false for classes with property hooks)
+--FILE--
+<?php
+
+class ClassWithPropertyHooks
+{
+    public string $name {
+        get => 'virtual';
+    }
+}
+
+class IterableClassWithPropertyHooks implements IteratorAggregate
+{
+    public string $name {
+        get => 'virtual';
+    }
+
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator([]);
+    }
+}
+
+$classes = [
+    'ClassWithPropertyHooks' => false,
+    'IterableClassWithPropertyHooks' => true,
+];
+
+foreach ($classes as $className => $expected) {
+    $status = (new ReflectionClass($className)->isIterable() === $expected) ? 'PASS' : 'FAIL';
+    echo "$className: $status\n";
+}
+
+?>
+--EXPECT--
+ClassWithPropertyHooks: PASS
+IterableClassWithPropertyHooks: PASS
diff --git a/ext/uri/uri_parser_rfc3986.c b/ext/uri/uri_parser_rfc3986.c
index 30707fde13020..a24fb467bf340 100644
--- a/ext/uri/uri_parser_rfc3986.c
+++ b/ext/uri/uri_parser_rfc3986.c
@@ -149,7 +149,7 @@ static zend_result php_uri_parser_rfc3986_scheme_write(void *uri, zval *value, z
 	}
 }
 
-ZEND_ATTRIBUTE_NONNULL zend_result php_uri_parser_rfc3986_userinfo_read(void *uri, php_uri_component_read_mode read_mode, zval *retval)
+ZEND_ATTRIBUTE_NONNULL zend_result php_uri_parser_rfc3986_userinfo_read(php_uri_parser_rfc3986_uris *uri, php_uri_component_read_mode read_mode, zval *retval)
 {
 	const UriUriA *uriparser_uri = get_uri_for_reading(uri, read_mode);
 
@@ -162,7 +162,7 @@ ZEND_ATTRIBUTE_NONNULL zend_result php_uri_parser_rfc3986_userinfo_read(void *ur
 	return SUCCESS;
 }
 
-zend_result php_uri_parser_rfc3986_userinfo_write(void *uri, zval *value, zval *errors)
+zend_result php_uri_parser_rfc3986_userinfo_write(php_uri_parser_rfc3986_uris *uri, zval *value, zval *errors)
 {
 	UriUriA *uriparser_uri = get_uri_for_writing(uri);
 	int result;
diff --git a/ext/uri/uri_parser_rfc3986.h b/ext/uri/uri_parser_rfc3986.h
index fbbfefb30af61..4d88478b6063d 100644
--- a/ext/uri/uri_parser_rfc3986.h
+++ b/ext/uri/uri_parser_rfc3986.h
@@ -23,8 +23,8 @@ PHPAPI extern const php_uri_parser php_uri_parser_rfc3986;
 
 typedef struct php_uri_parser_rfc3986_uris php_uri_parser_rfc3986_uris;
 
-zend_result php_uri_parser_rfc3986_userinfo_read(void *uri, php_uri_component_read_mode read_mode, zval *retval);
-zend_result php_uri_parser_rfc3986_userinfo_write(void *uri, zval *value, zval *errors);
+zend_result php_uri_parser_rfc3986_userinfo_read(php_uri_parser_rfc3986_uris *uri, php_uri_component_read_mode read_mode, zval *retval);
+zend_result php_uri_parser_rfc3986_userinfo_write(php_uri_parser_rfc3986_uris *uri, zval *value, zval *errors);
 
 php_uri_parser_rfc3986_uris *php_uri_parser_rfc3986_parse_ex(const char *uri_str, size_t uri_str_len, const php_uri_parser_rfc3986_uris *uriparser_base_url, bool silent);