diff --git a/ext/reflection/php_reflection.c b/ext/reflection/php_reflection.c
index d4f89be69f524..7b9c37d1eb51e 100644
--- a/ext/reflection/php_reflection.c
+++ b/ext/reflection/php_reflection.c
@@ -4190,7 +4190,7 @@ ZEND_METHOD(ReflectionClass, getMethods)
 	reflection_object *intern;
 	zend_class_entry *ce;
 	zend_function *mptr;
-	zend_long filter = 0;
+	zend_long filter;
 	zend_bool filter_is_null = 1;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l!", &filter, &filter_is_null) == FAILURE) {
@@ -4366,7 +4366,7 @@ ZEND_METHOD(ReflectionClass, getProperties)
 	zend_class_entry *ce;
 	zend_string *key;
 	zend_property_info *prop_info;
-	zend_long filter = 0;
+	zend_long filter;
 	zend_bool filter_is_null = 1;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l!", &filter, &filter_is_null) == FAILURE) {
@@ -4422,12 +4422,17 @@ ZEND_METHOD(ReflectionClass, getConstants)
 	zend_string *key;
 	zend_class_constant *constant;
 	zval val;
-	zend_long filter = ZEND_ACC_PPP_MASK;
+	zend_long filter;
+	zend_bool filter_is_null = 1;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l", &filter) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l!", &filter, &filter_is_null) == FAILURE) {
 		RETURN_THROWS();
 	}
 
+	if (filter_is_null) {
+		filter = ZEND_ACC_PPP_MASK;
+	}
+
 	GET_REFLECTION_OBJECT_PTR(ce);
 
 	array_init(return_value);
@@ -4452,12 +4457,17 @@ ZEND_METHOD(ReflectionClass, getReflectionConstants)
 	zend_class_entry *ce;
 	zend_string *name;
 	zend_class_constant *constant;
-	zend_long filter = ZEND_ACC_PPP_MASK;
+	zend_long filter;
+	zend_bool filter_is_null = 1;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l", &filter) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l!", &filter, &filter_is_null) == FAILURE) {
 		RETURN_THROWS();
 	}
 
+	if (filter_is_null) {
+		filter = ZEND_ACC_PPP_MASK;
+	}
+
 	GET_REFLECTION_OBJECT_PTR(ce);
 
 	array_init(return_value);
diff --git a/ext/reflection/php_reflection.stub.php b/ext/reflection/php_reflection.stub.php
index b150d1831ded5..cf6613c3a32ed 100644
--- a/ext/reflection/php_reflection.stub.php
+++ b/ext/reflection/php_reflection.stub.php
@@ -194,7 +194,7 @@ public function getDeclaringClass() {}
     public function getPrototype() {}
 
     /** @return void */
-    public function setAccessible(bool $isAccessible) {}
+    public function setAccessible(bool $accessible) {}
 }
 
 class ReflectionClass implements Reflector
@@ -260,10 +260,10 @@ public function getProperties(?int $filter = null) {}
     public function hasConstant(string $name) {}
 
     /** @return array|null */
-    public function getConstants(int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE) {}
+    public function getConstants(?int $filter = null) {}
 
     /** @return ReflectionClassConstant[] */
-    public function getReflectionConstants(int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE) {}
+    public function getReflectionConstants(?int $filter = null) {}
 
     /** @return mixed */
     public function getConstant(string $name) {}
@@ -364,7 +364,7 @@ public function getAttributes(?string $name = null, int $flags = 0): array {}
 
 class ReflectionObject extends ReflectionClass
 {
-    public function __construct(object $argument) {}
+    public function __construct(object $object) {}
 }
 
 class ReflectionProperty implements Reflector
@@ -415,7 +415,7 @@ public function getDeclaringClass() {}
     public function getDocComment() {}
 
     /** @return void */
-    public function setAccessible(bool $isAccessible) {}
+    public function setAccessible(bool $accessible) {}
 
     /** @return ReflectionType|null */
     public function getType() {}
@@ -475,7 +475,7 @@ class ReflectionParameter implements Reflector
     final private function __clone() {}
 
     /** @param string|array|object $function */
-    public function __construct($function, int|string $parameter) {}
+    public function __construct($function, int|string $param) {}
 
     public function __toString(): string {}
 
diff --git a/ext/reflection/php_reflection_arginfo.h b/ext/reflection/php_reflection_arginfo.h
index 5457b14d47003..6044f7f2434cd 100644
--- a/ext/reflection/php_reflection_arginfo.h
+++ b/ext/reflection/php_reflection_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 35e17de0cdf6c11a315f6d10fd711492d1da567c */
+ * Stub hash: 4429ea0f96f81c3dbfb2a7e6e00ce49aea4bfeb1 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_Reflection_getModifierNames, 0, 0, 1)
 	ZEND_ARG_TYPE_INFO(0, modifiers, IS_LONG, 0)
@@ -144,7 +144,7 @@ ZEND_END_ARG_INFO()
 #define arginfo_class_ReflectionMethod_getPrototype arginfo_class_ReflectionFunctionAbstract___clone
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ReflectionMethod_setAccessible, 0, 0, 1)
-	ZEND_ARG_TYPE_INFO(0, isAccessible, _IS_BOOL, 0)
+	ZEND_ARG_TYPE_INFO(0, accessible, _IS_BOOL, 0)
 ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionClass___clone arginfo_class_ReflectionFunctionAbstract___clone
@@ -195,11 +195,9 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionClass_hasConstant arginfo_class_ReflectionClass_hasMethod
 
-ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ReflectionClass_getConstants, 0, 0, 0)
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, filter, IS_LONG, 0, "ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE")
-ZEND_END_ARG_INFO()
+#define arginfo_class_ReflectionClass_getConstants arginfo_class_ReflectionClass_getMethods
 
-#define arginfo_class_ReflectionClass_getReflectionConstants arginfo_class_ReflectionClass_getConstants
+#define arginfo_class_ReflectionClass_getReflectionConstants arginfo_class_ReflectionClass_getMethods
 
 #define arginfo_class_ReflectionClass_getConstant arginfo_class_ReflectionClass_hasMethod
 
@@ -277,9 +275,7 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionClass_getAttributes arginfo_class_ReflectionFunctionAbstract_getAttributes
 
-ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ReflectionObject___construct, 0, 0, 1)
-	ZEND_ARG_TYPE_INFO(0, argument, IS_OBJECT, 0)
-ZEND_END_ARG_INFO()
+#define arginfo_class_ReflectionObject___construct arginfo_class_ReflectionClass_isInstance
 
 #define arginfo_class_ReflectionProperty___clone arginfo_class_ReflectionFunctionAbstract___clone
 
@@ -363,7 +359,7 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ReflectionParameter___construct, 0, 0, 2)
 	ZEND_ARG_INFO(0, function)
-	ZEND_ARG_TYPE_MASK(0, parameter, MAY_BE_LONG|MAY_BE_STRING, NULL)
+	ZEND_ARG_TYPE_MASK(0, param, MAY_BE_LONG|MAY_BE_STRING, NULL)
 ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionParameter___toString arginfo_class_ReflectionFunction___toString
diff --git a/ext/reflection/tests/ReflectionClass_toString_001.phpt b/ext/reflection/tests/ReflectionClass_toString_001.phpt
index 00e41bfcc9f68..13b6130a407e2 100644
--- a/ext/reflection/tests/ReflectionClass_toString_001.phpt
+++ b/ext/reflection/tests/ReflectionClass_toString_001.phpt
@@ -166,14 +166,14 @@ Class [ <internal:Reflection> class ReflectionClass implements Reflector, String
     Method [ <internal:Reflection> public method getConstants ] {
 
       - Parameters [1] {
-        Parameter #0 [ <optional> int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE ]
+        Parameter #0 [ <optional> ?int $filter = null ]
       }
     }
 
     Method [ <internal:Reflection> public method getReflectionConstants ] {
 
       - Parameters [1] {
-        Parameter #0 [ <optional> int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE ]
+        Parameter #0 [ <optional> ?int $filter = null ]
       }
     }
 
diff --git a/ext/reflection/tests/parameters_001.phpt b/ext/reflection/tests/parameters_001.phpt
index 8299a63bf9d69..d50d1a1e720ff 100644
--- a/ext/reflection/tests/parameters_001.phpt
+++ b/ext/reflection/tests/parameters_001.phpt
@@ -39,4 +39,4 @@ int(1)
 bool(false)
 bool(true)
 string(54) "The parameter specified by its name could not be found"
-string(95) "ReflectionParameter::__construct(): Argument #2 ($parameter) must be greater than or equal to 0"
+string(91) "ReflectionParameter::__construct(): Argument #2 ($param) must be greater than or equal to 0"