Add Reflection support for namespace visibility

Expose namespace-private visibility through Reflection API.

Add methods to query whether a member has namespace-scoped visibility:
* ReflectionMethod::isNamespacePrivate(): bool
* ReflectionProperty::isNamespacePrivate(): bool
* ReflectionProperty::isNamespacePrivateSet(): bool

These methods check the ZEND_ACC_NAMESPACE_PRIVATE and
ZEND_ACC_NAMESPACE_PRIVATE_SET flags respectively, allowing introspection
of namespace-scoped visibility.

Reflection bypasses namespace visibility checks (consistent with how it
handles private members), but these methods provide full introspection
capability.

Author: withinboredom

ext/reflection/php_reflection.c

@@ -3558,6 +3558,13 @@ ZEND_METHOD(ReflectionMethod, isProtected)
 }
 /* }}} */
 
+/* {{{ Returns whether this method is namespace-private */
+ZEND_METHOD(ReflectionMethod, isNamespacePrivate)
+{
+	_function_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_NAMESPACE_PRIVATE);
+}
+/* }}} */
+
 /* {{{ Returns whether this function is deprecated */
 ZEND_METHOD(ReflectionFunctionAbstract, isDeprecated)
 {
@@ -5833,6 +5840,13 @@ ZEND_METHOD(ReflectionProperty, isProtected)
 }
 /* }}} */
 
+/* {{{ Returns whether this property is namespace-private */
+ZEND_METHOD(ReflectionProperty, isNamespacePrivate)
+{
+	_property_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_NAMESPACE_PRIVATE);
+}
+/* }}} */
+
 ZEND_METHOD(ReflectionProperty, isPrivateSet)
 {
 	_property_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_PRIVATE_SET);
@@ -5843,6 +5857,11 @@ ZEND_METHOD(ReflectionProperty, isProtectedSet)
 	_property_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_PROTECTED_SET);
 }
 
+ZEND_METHOD(ReflectionProperty, isNamespacePrivateSet)
+{
+	_property_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_NAMESPACE_PRIVATE_SET);
+}
+
 /* {{{ Returns whether this property is static */
 ZEND_METHOD(ReflectionProperty, isStatic)
 {

ext/reflection/php_reflection.stub.php

@@ -193,6 +193,8 @@ public function isPrivate(): bool {}
     /** @tentative-return-type */
     public function isProtected(): bool {}
 
+    public function isNamespacePrivate(): bool {}
+
     /** @tentative-return-type */
     public function isAbstract(): bool {}
 
@@ -513,10 +515,14 @@ public function isPrivate(): bool {}
     /** @tentative-return-type */
     public function isProtected(): bool {}
 
+    public function isNamespacePrivate(): bool {}
+
     public function isPrivateSet(): bool {}
 
     public function isProtectedSet(): bool {}
 
+    public function isNamespacePrivateSet(): bool {}
+
     /** @tentative-return-type */
     public function isStatic(): bool {}