Add ReflectionProperty::isDynamic() as an alternative to isDefault()

UPGRADING

@@ -431,6 +431,7 @@ PHP 8.4 UPGRADE NOTES
     - ReflectionClass::SKIP_INITIALIZATION_ON_SERIALIZE
     - ReflectionClass::SKIP_DESTRUCTOR
     RFC: https://wiki.php.net/rfc/lazy-objects
+  . ReflectionProperty::isDynamic() was introduced.
 
 - SOAP:
   . Added support for clark notation for namespaces in class map.

ext/reflection/php_reflection.c

@@ -5921,8 +5921,7 @@ ZEND_METHOD(ReflectionProperty, isVirtual)
 	_property_check_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_VIRTUAL);
 }
 
-/* {{{ Returns whether this property is default (declared at compilation time). */
-ZEND_METHOD(ReflectionProperty, isDefault)
+static void _property_check_dynamic(INTERNAL_FUNCTION_PARAMETERS, bool dynamic_true)
 {
 	reflection_object *intern;
 	property_reference *ref;
@@ -5931,7 +5930,21 @@ ZEND_METHOD(ReflectionProperty, isDefault)
 		RETURN_THROWS();
 	}
 	GET_REFLECTION_OBJECT_PTR(ref);
-	RETURN_BOOL(ref->prop != NULL);
+	bool is_dynamic = ref->prop == NULL;
+	RETURN_BOOL(dynamic_true ? is_dynamic : !is_dynamic);
+}
+
+/* {{{ Returns whether this property is default (declared at compilation time). */
+ZEND_METHOD(ReflectionProperty, isDefault)
+{
+	_property_check_dynamic(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
+}
+/* }}} */
+
+/* {{{ Returns whether this property is dynamic (not declared at compilation time). */
+ZEND_METHOD(ReflectionProperty, isDynamic)
+{
+	_property_check_dynamic(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
 }
 /* }}} */
 

ext/reflection/php_reflection.stub.php

@@ -522,6 +522,8 @@ public function isReadOnly(): bool {}
     /** @tentative-return-type */
     public function isDefault(): bool {}
 
+    public function isDynamic(): bool {}
+
     public function isAbstract(): bool {}
 
     public function isVirtual(): bool {}

ext/reflection/tests/ReflectionProperty_basic2.phpt

@@ -1,16 +1,19 @@
 --TEST--
-Test usage of ReflectionProperty methods isDefault(), getModifiers(), getDeclaringClass() and getDocComment().
+Test usage of ReflectionProperty methods isDefault(), isDynamic(), getModifiers(), getDeclaringClass() and getDocComment().
 --INI--
 opcache.save_comments=1
 --FILE--
 <?php
 
-function reflectProperty($class, $property) {
-    $propInfo = new ReflectionProperty($class, $property);
+function reflectProperty($classOrObj, $property, $className = null) {
+    $className ??= $classOrObj;
+    $propInfo = new ReflectionProperty($classOrObj, $property);
     echo "**********************************\n";
-    echo "Reflecting on property $class::$property\n\n";
+    echo "Reflecting on property $className::$property\n\n";
     echo "isDefault():\n";
     var_dump($propInfo->isDefault());
+    echo "isDynamic():\n";
+    var_dump($propInfo->isDynamic());
     echo "getModifiers():\n";
     var_dump($propInfo->getModifiers());
     echo "getDeclaringClass():\n";
@@ -20,6 +23,7 @@ function reflectProperty($class, $property) {
     echo "\n**********************************\n";
 }
 
+#[AllowDynamicProperties]
 class TestClass {
     public $pub;
     static public $stat = "static property";
@@ -35,13 +39,19 @@ reflectProperty("TestClass", "stat");
 reflectProperty("TestClass", "prot");
 reflectProperty("TestClass", "priv");
 
+$obj = new TestClass();
+$obj->dyn = 'dynamic';
+reflectProperty($obj, "dyn", "TestClass");
+
 ?>
 --EXPECTF--
 **********************************
 Reflecting on property TestClass::pub
 
 isDefault():
 bool(true)
+isDynamic():
+bool(false)
 getModifiers():
 int(1)
 getDeclaringClass():
@@ -58,6 +68,8 @@ Reflecting on property TestClass::stat
 
 isDefault():
 bool(true)
+isDynamic():
+bool(false)
 getModifiers():
 int(17)
 getDeclaringClass():
@@ -74,6 +86,8 @@ Reflecting on property TestClass::prot
 
 isDefault():
 bool(true)
+isDynamic():
+bool(false)
 getModifiers():
 int(2)
 getDeclaringClass():
@@ -92,6 +106,8 @@ Reflecting on property TestClass::priv
 
 isDefault():
 bool(true)
+isDynamic():
+bool(false)
 getModifiers():
 int(4)
 getDeclaringClass():
@@ -103,3 +119,21 @@ getDocComment():
 bool(false)
 
 **********************************
+**********************************
+Reflecting on property TestClass::dyn
+
+isDefault():
+bool(false)
+isDynamic():
+bool(true)
+getModifiers():
+int(1)
+getDeclaringClass():
+object(ReflectionClass)#%d (1) {
+  ["name"]=>
+  string(9) "TestClass"
+}
+getDocComment():
+bool(false)
+
+**********************************

ext/reflection/tests/ReflectionProperty_isDynamic_basic.phpt

@@ -0,0 +1,69 @@
+--TEST--
+Test ReflectionProperty::isDynamic() usage.
+--FILE--
+<?php
+
+function reflectProperty($classOrObj, $property, $className = null) {
+    $className ??= $classOrObj;
+    $propInfo = new ReflectionProperty($classOrObj, $property);
+    echo "**********************************\n";
+    echo "Reflecting on property $className::$property\n\n";
+    echo "isDynamic():\n";
+    var_dump($propInfo->isDynamic());
+    echo "\n**********************************\n";
+}
+
+#[AllowDynamicProperties]
+class TestClass {
+    public $pub;
+    static public $stat = "static property";
+    protected $prot = 4;
+    private $priv = "keepOut";
+}
+
+reflectProperty("TestClass", "pub");
+reflectProperty("TestClass", "stat");
+reflectProperty("TestClass", "prot");
+reflectProperty("TestClass", "priv");
+
+$obj = new TestClass();
+$obj->dyn = 'dynamic';
+reflectProperty($obj, "dyn", "TestClass");
+
+?>
+--EXPECT--
+**********************************
+Reflecting on property TestClass::pub
+
+isDynamic():
+bool(false)
+
+**********************************
+**********************************
+Reflecting on property TestClass::stat
+
+isDynamic():
+bool(false)
+
+**********************************
+**********************************
+Reflecting on property TestClass::prot
+
+isDynamic():
+bool(false)
+
+**********************************
+**********************************
+Reflecting on property TestClass::priv
+
+isDynamic():
+bool(false)
+
+**********************************
+**********************************
+Reflecting on property TestClass::dyn
+
+isDynamic():
+bool(true)
+
+**********************************