Deprecate implicit dynamic properties

Writing to a proprety that hasn't been declared is deprecated,
unless the class uses the #[AllowDynamicProperties] attribute or
defines __get()/__set().

RFC: https://wiki.php.net/rfc/deprecate_dynamic_properties

UPGRADING

@@ -48,6 +48,16 @@ PHP 8.2 UPGRADE NOTES
 ========================================
 
 - Core:
+  . Creation of dynamic properties is deprecated, unless the class opts in by
+    using the #[AllowDynamicProperties] attribute. stdClass allows dynamic
+    properties. Usage of __get()/__set() is not affected by this change. A
+    dynamic properties deprecation warning can be addressed by:
+     - Declaring the property (preferred).
+     - Adding the #[AllowDynamicProperties] attribute to the class (which also
+       applies to all child classes).
+     - Using a WeakMap if you wish to associate additional data with an object
+       you do not own.
+
   . Callables that are not accepted by the $callable() syntax (but are accepted
     by call_user_func) are deprecated. In particular:
 

Zend/Optimizer/sccp.c

@@ -1101,7 +1101,9 @@ static void sccp_visit_instr(scdf_ctx *scdf, zend_op *opline, zend_ssa_op *ssa_o
 
 				/* Don't try to propagate assignments to (potentially) typed properties. We would
 				 * need to deal with errors and type conversions first. */
-				if (!var_info->ce || (var_info->ce->ce_flags & ZEND_ACC_HAS_TYPE_HINTS)) {
+				// TODO: Distinguish dynamic and declared property assignments here?
+				if (!var_info->ce || (var_info->ce->ce_flags & ZEND_ACC_HAS_TYPE_HINTS) ||
+						!(var_info->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					SET_RESULT_BOT(result);
 					SET_RESULT_BOT(op1);
 					return;

Zend/Optimizer/zend_inference.c

@@ -4842,15 +4842,17 @@ ZEND_API bool zend_may_throw_ex(const zend_op *opline, const zend_ssa_op *ssa_op
 					return 1;
 				}
 
-				if (op_array->scope != ce && ce->default_properties_count) {
 				zend_property_info *prop_info =
 					zend_hash_find_ptr(&ce->properties_info, prop_name);
-					if (prop_info && (!(prop_info->flags & ZEND_ACC_PUBLIC)
+				if (prop_info) {
-								|| ZEND_TYPE_IS_SET(prop_info->type))) {
+					if (ZEND_TYPE_IS_SET(prop_info->type)) {
 						return 1;
 					}
+					return !(prop_info->flags & ZEND_ACC_PUBLIC)
+						&& prop_info->ce != op_array->scope;
+				} else {
+					return !(ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES);
 				}
-				return 0;
 			}
 			return 1;
 		case ZEND_ROPE_INIT:

Zend/tests/allow_dynamic_properties_on_interface.phpt

@@ -0,0 +1,11 @@
+--TEST--
+#[AllowDynamicProperties] cannot be applied to interface
+--FILE--
+<?php
+
+#[AllowDynamicProperties]
+interface Test {}
+
+?>
+--EXPECTF--
+Fatal error: Cannot apply #[AllowDynamicProperties] to interface in %s on line %d

Zend/tests/allow_dynamic_properties_on_trait.phpt

@@ -0,0 +1,11 @@
+--TEST--
+#[AllowDynamicProperties] cannot be applied to trait
+--FILE--
+<?php
+
+#[AllowDynamicProperties]
+trait Test {}
+
+?>
+--EXPECTF--
+Fatal error: Cannot apply #[AllowDynamicProperties] to trait in %s on line %d

Zend/tests/anon/003.phpt

@@ -4,7 +4,7 @@ reusing anonymous classes
 <?php
 while (@$i++<10) {
     var_dump(new class($i) {
-
+        public $i;
         public function __construct($i) {
             $this->i = $i;
         }

Zend/tests/assign_to_obj_001.phpt

@@ -8,6 +8,7 @@ function &a($i) {
 }
 
 class A {
+    public $a;
     public function test() {
         $this->a = a(1);
         unset($this->a);

Zend/tests/bug27268.phpt

@@ -2,6 +2,7 @@
 Bug #27268 (Bad references accentuated by clone)
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class A
 {
     public function &getA()

Zend/tests/bug30162.phpt

@@ -2,6 +2,7 @@
 Bug #30162 (Catching exception in constructor couses lose of $this)
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class FIIFO {
 
     public function __construct() {
@@ -11,6 +12,7 @@ class FIIFO {
 
 }
 
+#[AllowDynamicProperties]
 class hariCow extends FIIFO {
 
     public function __construct() {

Zend/tests/bug38779_1.phpt

@@ -4,6 +4,7 @@ Bug #38779 (engine crashes when require()'ing file with syntax error through use
 <?php
 
 class Loader {
+    public $context;
     private $position;
     private $data;
     public function stream_open($path, $mode, $options, &$opened_path)  {

Zend/tests/bug47343.phpt

@@ -4,6 +4,7 @@ Bug #47343 (gc_collect_cycles causes a segfault when called within a destructor
 <?php
 class A
 {
+    public $data = [];
     public function __destruct()
     {
         gc_collect_cycles();
@@ -20,10 +21,7 @@ class A
 
 class B
 {
-    public function __construct($A)
+    public function __construct(public $A) {}
-    {
-        $this->A = $A;
-    }
 
     public function __destruct()
     {

Zend/tests/bug49893.phpt

@@ -12,6 +12,7 @@ class A {
     }
 }
 class B {
+    public $a;
     function __construct() {
         $this->a = new A();
         throw new Exception("1");

Zend/tests/bug51822.phpt

@@ -12,6 +12,7 @@ class DestructableObject
 
 class DestructorCreator
 {
+    public $test;
     public function __destruct()
     {
         $this->test = new DestructableObject;

Zend/tests/bug54268.phpt

@@ -20,6 +20,7 @@ class DestructableObject
 }
 class DestructorCreator
 {
+        public $test;
         public function __destruct()
         {
                 $this->test = new DestructableObject;

Zend/tests/bug55305.phpt

@@ -2,6 +2,7 @@
 Bug #55305 (ref lost: 1st ref instantiated in class def, 2nd ref made w/o instantiating)
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class Foo {
   var $foo = "test";
 }

Zend/tests/bug60536_001.phpt

@@ -12,6 +12,7 @@ class Y extends X {
           return ++$this->x;
       }
 }
+#[AllowDynamicProperties]
 class Z extends Y {
       function __construct() {
           return ++$this->x;

Zend/tests/bug60833.phpt

@@ -5,8 +5,8 @@ Bug #60833 (self, parent, static behave inconsistently case-sensitive)
 class A {
     static $x = "A";
     function testit() {
-        $this->v1 = new sELF;
+        var_dump(new sELF);
-        $this->v2 = new SELF;
+        var_dump(new SELF);
     }
 }
 
@@ -14,26 +14,21 @@ class B extends A {
     static $x = "B";
     function testit() {
         PARENT::testit();
-        $this->v3 = new sELF;
+        var_dump(new sELF);
-        $this->v4 = new PARENT;
+        var_dump(new PARENT);
-        $this->v4 = STATIC::$x;
+        var_dump(STATIC::$x);
     }
 }
 $t = new B();
 $t->testit();
-var_dump($t);
 ?>
---EXPECTF--
+--EXPECT--
-object(B)#%d (4) {
+object(A)#2 (0) {
-  ["v1"]=>
-  object(A)#%d (0) {
-  }
-  ["v2"]=>
-  object(A)#%d (0) {
-  }
-  ["v3"]=>
-  object(B)#%d (0) {
-  }
-  ["v4"]=>
-  string(1) "B"
 }
+object(A)#2 (0) {
+}
+object(B)#2 (0) {
+}
+object(A)#2 (0) {
+}
+string(1) "B"

Zend/tests/bug63462.phpt

@@ -4,6 +4,7 @@ Test script to verify that magic methods should be called only once when accessi
 Marco Pivetta <ocramius@gmail.com>
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class Test {
     public    $publicProperty;
     protected $protectedProperty;

Zend/tests/bug64821.1.phpt

@@ -3,6 +3,7 @@ Bug #64821 Custom Exceptions crash when internal properties overridden (variatio
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class a extends exception {
     public function __construct() {
         $this->message = NULL;

Zend/tests/bug64960.phpt

@@ -31,6 +31,10 @@ $a['waa'];
 --EXPECTF--
 Notice: ob_end_flush(): Failed to delete and flush buffer. No buffer to delete or flush in %sbug64960.php on line 3
 
+Deprecated: Creation of dynamic property Exception::$_trace is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property Exception::$_trace is deprecated in %s on line %d
+
 Fatal error: Uncaught Exception in %sbug64960.php:19
 Stack trace:
 #0 [internal function]: {closure}(8, 'ob_end_clean():...', '%s', 9)

Zend/tests/bug65911.phpt

@@ -6,6 +6,7 @@ class A {}
 
 class B
 {
+    public $foo;
     public function go()
     {
         $this->foo = 'bar';

Zend/tests/bug66609.phpt

@@ -10,6 +10,7 @@ class Bar {
         return $foo->foo;
     }
 }
+#[AllowDynamicProperties]
 class Foo {
     public function __get($x) {
         global $bar;

Zend/tests/bug69446.phpt

@@ -5,6 +5,7 @@ zend.enable_gc = 1
 --FILE--
 <?php
 $bar = NULL;
+#[AllowDynamicProperties]
 class bad {
     public function __destruct() {
         global $bar;

Zend/tests/bug70223.phpt

@@ -3,6 +3,9 @@ Bug #70223 (Incrementing value returned by magic getter)
 --FILE--
 <?php
 
+// Note that this actually writes to dynamic property A::$f.
+// Increment goes through __set(), not __get() by reference!
+#[AllowDynamicProperties]
 class A {
 
     private $foo = 0;

Zend/tests/bug70397.phpt

@@ -8,7 +8,9 @@ $f = function () {
     yield $this->value;
 };
 
-var_dump($f->call(new class {})->current());
+var_dump($f->call(new class {
+    public $value;
+})->current());
 
 ?>
 --EXPECT--

Zend/tests/bug70805.phpt

@@ -3,9 +3,11 @@ Bug #70805 (Segmentation faults whilst running Drupal 8 test suite)
 --FILE--
 <?php
 class A {
+    public $b;
 }
 
 class B {
+    public $a;
 }
 
 class C {

Zend/tests/bug70805_1.phpt

@@ -5,9 +5,11 @@ zend.enable_gc = 1
 --FILE--
 <?php
 class A {
+    public $b;
 }
 
 class B {
+    public $a;
 }
 
 class C {

Zend/tests/bug70805_2.phpt

@@ -5,9 +5,11 @@ zend.enable_gc = 1
 --FILE--
 <?php
 class A {
+    public $b;
 }
 
 class B {
+    public $a;
 }
 
 class C {

Zend/tests/bug71859.phpt

@@ -3,6 +3,7 @@ Bug #71859 (zend_objects_store_call_destructors operates on realloced memory, cr
 --FILE--
 <?php
 class constructs_in_destructor {
+  public $a;
   public function __destruct() {
     //We are now in zend_objects_store_call_destructors
     //This causes a realloc in zend_objects_store_put

Zend/tests/bug72101.phpt

@@ -26,6 +26,7 @@ class PHPUnit_Framework_MockObject_InvocationMocker {
 
 class PHPUnit_Framework_MockObject_Matcher {
     public $stub = null;
+    public $methodNameMatcher;
     public function invoked($invocation) {
         return $this->stub->invoke($invocation);
     }
@@ -77,10 +78,10 @@ $foo->bar($a, $b, $c);
 --EXPECTF--
 Fatal error: Uncaught Error: Class "DoesNotExists" not found in %s:%d
 Stack trace:
-#0 %sbug72101.php(8): {closure}(2, 'MethodCallbackB...', '%s', 8)
+#0 %sbug72101.php(%d): {closure}(2, 'MethodCallbackB...', '%s', 8)
-#1 %sbug72101.php(27): PHPUnit_Framework_MockObject_Stub_ReturnCallback->invoke(Object(PHPUnit_Framework_MockObject_Invocation_Static))
+#1 %sbug72101.php(%d): PHPUnit_Framework_MockObject_Stub_ReturnCallback->invoke(Object(PHPUnit_Framework_MockObject_Invocation_Static))
-#2 %sbug72101.php(19): PHPUnit_Framework_MockObject_Matcher->invoked(Object(PHPUnit_Framework_MockObject_Invocation_Static))
+#2 %sbug72101.php(%d): PHPUnit_Framework_MockObject_Matcher->invoked(Object(PHPUnit_Framework_MockObject_Invocation_Static))
-#3 %sbug72101.php(52): PHPUnit_Framework_MockObject_InvocationMocker->invoke(Object(PHPUnit_Framework_MockObject_Invocation_Static))
+#3 %sbug72101.php(%d): PHPUnit_Framework_MockObject_InvocationMocker->invoke(Object(PHPUnit_Framework_MockObject_Invocation_Static))
-#4 %sbug72101.php(72): Mock_MethodCallbackByReference_7b180d26->bar(0, 0, 0)
+#4 %sbug72101.php(%d): Mock_MethodCallbackByReference_7b180d26->bar(0, 0, 0)
 #5 {main}
-  thrown in %sbug72101.php on line 61
+  thrown in %sbug72101.php on line %d

Zend/tests/bug78010.phpt

@@ -5,6 +5,7 @@ memory_limit=2G
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class foo
 {
     public function __construct()

Zend/tests/bug78340.phpt

@@ -4,9 +4,10 @@ Bug #78340: Include of stream wrapper not reading whole file
 <?php
 
 class lib {
+  public $context;
   public static $files= [];
 
-  private $bytes, $pos;
+  private $bytes, $pos, $ino;
 
   function stream_open($path, $mode, $options, $opened_path) {
     $this->bytes= self::$files[$path];

Zend/tests/bug78379.phpt

@@ -3,10 +3,12 @@ Bug #78379 (Cast to object confuses GC, causes crash)
 --FILE--
 <?php
 class C {
+    public $p;
     public function __construct() {
         $this->p = (object)["x" => [1]];
     }
 }
+#[AllowDynamicProperties]
 class E {
 }
 $e = new E;

Zend/tests/bug78379_2.phpt

@@ -2,6 +2,7 @@
 Bug #78379.2 (Cast to object confuses GC, causes crash)
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class E {}
 function f() {
     $e1 = new E;

Zend/tests/bug78589.phpt

@@ -4,6 +4,7 @@ Bug #78589: Memory leak with GC + __destruct()
 <?php
 
 class Test {
+    public $foo;
     public function __destruct() {}
 }
 

Zend/tests/bug79477.phpt

@@ -3,6 +3,7 @@ Bug #79477: casting object into array creates references
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class Test {
     public $prop = 'default value';
 }

Zend/tests/bug79862.phpt

@@ -3,6 +3,7 @@ Bug #79862: Public non-static property in child should take priority over privat
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class a {
     private static $prop1;
     private static $prop2;

Zend/tests/bug81104.phpt

@@ -5,6 +5,7 @@ memory_limit=5M
 report_memleaks=0
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class X {
     public $x;
     public function __construct() { $this->x = [$this]; }

Zend/tests/closure_020.phpt

@@ -5,6 +5,7 @@ Closure 020: Trying to access private property outside class
 
 class foo {
     private $test = 3;
+    public $a;
 
     public function x() {
         $a = &$this;

Zend/tests/closure_026.phpt

@@ -4,6 +4,7 @@ Closure 026: Assigning a closure object to an array in $this
 <?php
 
 class foo {
+    public $a;
     public function __construct() {
         $a =& $this;
 

Zend/tests/dynamic_prop_deprecation.phpt

@@ -0,0 +1,47 @@
+--TEST--
+Dynamic properties deprecation
+--FILE--
+<?php
+
+class Test {}
+
+$obj = new Test;
+$obj->prop = 1; // Deprecated
+$obj->prop = 1; // Ok
+$obj->prop2 += 1; // Deprecated
+$obj->prop2 += 1; // Ok
+$obj->prop3++; // Deprecated
+$obj->prop3++; // Ok
+$obj->prop4[] = 1; // Deprecated
+$obj->prop4[] = 1; // Ok
+isset($obj->prop5); // Ok
+unset($obj->prop6); // Ok
+
+// stdClass should not throw deprecation.
+$obj = new stdClass;
+$obj->prop = 1;
+
+// Classes with #[AllowDynamicProperties] should not throw deprecation.
+#[AllowDynamicProperties]
+class Test2 {}
+class Test3 extends Test2 {}
+
+$obj = new Test2;
+$obj->prop = 1;
+
+$obj = new Test3;
+$obj->prop = 1;
+
+?>
+--EXPECTF--
+Deprecated: Creation of dynamic property Test::$prop is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property Test::$prop2 is deprecated in %s on line %d
+
+Warning: Undefined property: Test::$prop2 in %s on line %d
+
+Deprecated: Creation of dynamic property Test::$prop3 is deprecated in %s on line %d
+
+Warning: Undefined property: Test::$prop3 in %s on line %d
+
+Deprecated: Creation of dynamic property Test::$prop4 is deprecated in %s on line %d

Zend/tests/exception_stream_wrapper.phpt

@@ -4,6 +4,7 @@ Exception in stream wrapper + __call
 <?php
 
 class Loader {
+    public $context;
     function stream_open() {
         return true;
     }

Zend/tests/fibers/no-switch-gc.phpt

@@ -5,9 +5,10 @@ Context switches are prevented during GC collect cycles
 
 $fiber = new Fiber(function () {
     call_user_func(function () {
-        $a = new class () {};
+        $a = new class { public $next; };
 
-        $b = new class () {
+        $b = new class {
+            public $next;
             public function __destruct() {
                 Fiber::suspend();
             }

Zend/tests/foreach_shadowed_dyn_property.phpt

@@ -13,6 +13,8 @@ class Test {
         var_dump(get_object_vars($this));
     }
 }
+
+#[AllowDynamicProperties]
 class Test2 extends Test {
 }
 

Zend/tests/gc_038.phpt

@@ -126,13 +126,14 @@ function test_pow() {
 test_pow();
 
 class Y {
+    public $x;
     function __toString() {
         return "y";
     }
 }
 function test_concat() {
     $x = new Y;
-    $x->x= $x;
+    $x->x = $x;
     @$x .= "x";
     $n = gc_collect_cycles();
     echo ".=\t$n\n";

Zend/tests/gc_042.phpt

@@ -3,6 +3,7 @@ Object properties HT may need to be removed from nested data
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class Test {
     public function __destruct() {
         $GLOBALS['x'] = $this;

Zend/tests/generators/iterator_wrapper_leak.phpt

@@ -4,6 +4,8 @@ A generator iterator wrapper involved in a cycle should not leak
 <?php
 
 class Test {
+    private $gen1;
+    private $gen2;
     public function method() {
         $this->gen1 = (function () {
             yield 1;

Zend/tests/get_mangled_object_vars.phpt

@@ -3,6 +3,7 @@ get_mangled_object_vars() function
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class A {
     public $pub = 1;
     protected $prot = 2;
@@ -19,6 +20,7 @@ $obj->{"6"} = 6;
 var_export(get_mangled_object_vars($obj));
 echo "\n";
 
+#[AllowDynamicProperties]
 class AO extends ArrayObject {
     private $priv = 1;
 }

Zend/tests/nowdoc.inc

@@ -4,7 +4,7 @@
 $a = 1;
 $b = 2;
 $c = array( 'c' => 3, );
-class d { public function __construct() { $this->d = 4; } };
+class d { public $d = 4; };
 $d = new d;
 
 ?>

Zend/tests/temporary_cleaning_013.phpt

@@ -77,6 +77,7 @@ try {
 
 try {
     var_dump((function() { return new class {
+        public $foo;
         function __construct() { $this->foo = new stdClass; }
         function __destruct() { throw new Exception; }
     }; })()->foo++);
@@ -92,6 +93,7 @@ try {
 
 try {
     var_dump((function() { return new class {
+        public $bar;
         function __construct() { $this->bar = new stdClass; }
         function &__get($x) { return $this->bar; }
         function __destruct() { throw new Exception; }
@@ -115,6 +117,7 @@ try {
 
 try {
     var_dump(++(function() { return new class {
+        public $bar;
         function __construct() { $this->bar = new stdClass; }
         function &__get($x) { return $this->bar; }
         function __destruct() { throw new Exception; }
@@ -143,6 +146,7 @@ try {
 
 try {
     var_dump((new class {
+        public $foo;
         function __construct() { $this->foo = new stdClass; }
         function __destruct() { throw new Exception; }
     })->foo);
@@ -168,6 +172,7 @@ try {
 
 try {
     var_dump(isset((new class {
+        public $foo;
         function __construct() { $this->foo = new stdClass; }
         function __destruct() { throw new Exception; }
     })->foo->bar));
@@ -278,14 +283,22 @@ caught Exception 2
 caught Exception 3
 caught Exception 4
 caught Exception 5
+
+Deprecated: Creation of dynamic property class@anonymous::$foo is deprecated in %s on line %d
 caught Exception 6
 caught Exception 7
 caught Exception 8
 caught Exception 9
 caught Exception 10
+
+Deprecated: Creation of dynamic property class@anonymous::$foo is deprecated in %s on line %d
 caught Exception 11
+
+Deprecated: Creation of dynamic property class@anonymous::$foo is deprecated in %s on line %d
 caught Exception 12
 caught Exception 13
+
+Deprecated: Creation of dynamic property class@anonymous::$foo is deprecated in %s on line %d
 caught Exception 14
 
 Notice: Indirect modification of overloaded element of ArrayAccess@anonymous has no effect in %s on line %d

Zend/tests/throwing_overloaded_compound_assign_op.phpt

@@ -3,6 +3,7 @@ Exception in compound assign op should prevent call to overloaded object handler
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class Test {
     public function __get($k) {
         $this->$k = 42;

Zend/tests/type_declarations/typed_properties_086.phpt

@@ -3,6 +3,7 @@ Test typed properties with integer keys
 --FILE--
 <?php
 
+#[AllowDynamicProperties]
 class T {
     // Class must have at least one property. Property must have a type.
     // Empty class or untyped property removes segfault

Zend/zend_attributes.c

@@ -25,6 +25,7 @@
 
 ZEND_API zend_class_entry *zend_ce_attribute;
 ZEND_API zend_class_entry *zend_ce_return_type_will_change_attribute;
+ZEND_API zend_class_entry *zend_ce_allow_dynamic_properties;
 
 static HashTable internal_attributes;
 
@@ -56,6 +57,18 @@ void validate_attribute(zend_attribute *attr, uint32_t target, zend_class_entry
 	}
 }
 
+static void validate_allow_dynamic_properties(
+		zend_attribute *attr, uint32_t target, zend_class_entry *scope)
+{
+	if (scope->ce_flags & ZEND_ACC_TRAIT) {
+		zend_error_noreturn(E_ERROR, "Cannot apply #[AllowDynamicProperties] to trait");
+	}
+	if (scope->ce_flags & ZEND_ACC_INTERFACE) {
+		zend_error_noreturn(E_ERROR, "Cannot apply #[AllowDynamicProperties] to interface");
+	}
+	scope->ce_flags |= ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES;
+}
+
 ZEND_METHOD(Attribute, __construct)
 {
 	zend_long flags = ZEND_ATTRIBUTE_TARGET_ALL;
@@ -73,6 +86,11 @@ ZEND_METHOD(ReturnTypeWillChange, __construct)
 	ZEND_PARSE_PARAMETERS_NONE();
 }
 
+ZEND_METHOD(AllowDynamicProperties, __construct)
+{
+	ZEND_PARSE_PARAMETERS_NONE();
+}
+
 static zend_attribute *get_attribute(HashTable *attributes, zend_string *lcname, uint32_t offset)
 {
 	if (attributes) {
@@ -288,6 +306,10 @@ void zend_register_attribute_ce(void)
 
 	zend_ce_return_type_will_change_attribute = register_class_ReturnTypeWillChange();
 	zend_internal_attribute_register(zend_ce_return_type_will_change_attribute, ZEND_ATTRIBUTE_TARGET_METHOD);
+
+	zend_ce_allow_dynamic_properties = register_class_AllowDynamicProperties();
+	attr = zend_internal_attribute_register(zend_ce_allow_dynamic_properties, ZEND_ATTRIBUTE_TARGET_CLASS);
+	attr->validator = validate_allow_dynamic_properties;
 }
 
 void zend_attributes_shutdown(void)

Zend/zend_attributes.h

@@ -40,6 +40,7 @@
 BEGIN_EXTERN_C()
 
 extern ZEND_API zend_class_entry *zend_ce_attribute;
+extern ZEND_API zend_class_entry *zend_ce_allow_dynamic_properties;
 
 typedef struct {
 	zend_string *name;

Zend/zend_attributes.stub.php

@@ -13,3 +13,8 @@ final class ReturnTypeWillChange
 {
     public function __construct() {}
 }
+
+final class AllowDynamicProperties
+{
+    public function __construct() {}
+}

Zend/zend_attributes_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 3fd949e1b9f49666bed3081ed1e8e711acd9f49c */
+ * Stub hash: 024e849a9dfa8789f13dd1d2ac222a48e4b017f1 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_Attribute___construct, 0, 0, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, flags, IS_LONG, 0, "Attribute::TARGET_ALL")
@@ -8,9 +8,12 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ReturnTypeWillChange___construct, 0, 0, 0)
 ZEND_END_ARG_INFO()
 
+#define arginfo_class_AllowDynamicProperties___construct arginfo_class_ReturnTypeWillChange___construct
+
 
 ZEND_METHOD(Attribute, __construct);
 ZEND_METHOD(ReturnTypeWillChange, __construct);
+ZEND_METHOD(AllowDynamicProperties, __construct);
 
 
 static const zend_function_entry class_Attribute_methods[] = {
@@ -24,6 +27,12 @@ static const zend_function_entry class_ReturnTypeWillChange_methods[] = {
 	ZEND_FE_END
 };
 
+
+static const zend_function_entry class_AllowDynamicProperties_methods[] = {
+	ZEND_ME(AllowDynamicProperties, __construct, arginfo_class_AllowDynamicProperties___construct, ZEND_ACC_PUBLIC)
+	ZEND_FE_END
+};
+
 static zend_class_entry *register_class_Attribute(void)
 {
 	zend_class_entry ce, *class_entry;
@@ -51,3 +60,14 @@ static zend_class_entry *register_class_ReturnTypeWillChange(void)
 
 	return class_entry;
 }
+
+static zend_class_entry *register_class_AllowDynamicProperties(void)
+{
+	zend_class_entry ce, *class_entry;
+
+	INIT_CLASS_ENTRY(ce, "AllowDynamicProperties", class_AllowDynamicProperties_methods);
+	class_entry = zend_register_internal_class_ex(&ce, NULL);
+	class_entry->ce_flags |= ZEND_ACC_FINAL;
+
+	return class_entry;
+}

Zend/zend_builtin_functions.c

@@ -19,6 +19,7 @@
 
 #include "zend.h"
 #include "zend_API.h"
+#include "zend_attributes.h"
 #include "zend_gc.h"
 #include "zend_builtin_functions.h"
 #include "zend_constants.h"
@@ -33,10 +34,12 @@
 /* }}} */
 
 ZEND_MINIT_FUNCTION(core) { /* {{{ */
-	zend_standard_class_def = register_class_stdClass();
-
 	zend_register_default_classes();
 
+	zend_standard_class_def = register_class_stdClass();
+	zend_add_class_attribute(zend_standard_class_def, zend_ce_allow_dynamic_properties->name, 0);
+	zend_standard_class_def->ce_flags |= ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES;
+
 	return SUCCESS;
 }
 /* }}} */

Zend/zend_compile.h

@@ -240,7 +240,7 @@ typedef struct _zend_oparray_context {
 /* or IS_CONSTANT_VISITED_MARK                            |     |     |     */
 #define ZEND_CLASS_CONST_IS_CASE         (1 << 6)  /*     |     |     |  X  */
 /*                                                        |     |     |     */
-/* Class Flags (unused: 15,16,21,30,31)                   |     |     |     */
+/* Class Flags (unused: 16,21,30,31)                      |     |     |     */
 /* ===========                                            |     |     |     */
 /*                                                        |     |     |     */
 /* Special class types                                    |     |     |     */
@@ -269,6 +269,10 @@ typedef struct _zend_oparray_context {
 /* User class has methods with static variables           |     |     |     */
 #define ZEND_HAS_STATIC_IN_METHODS       (1 << 14) /*  X  |     |     |     */
 /*                                                        |     |     |     */
+/* Objects of this class may have dynamic properties      |     |     |     */
+/* without triggering a deprecation warning               |     |     |     */
+#define ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES (1 << 15) /* X  |     |     |     */
+/*                                                        |     |     |     */
 /* Parent class is resolved (CE).                         |     |     |     */
 #define ZEND_ACC_RESOLVED_PARENT         (1 << 17) /*  X  |     |     |     */
 /*                                                        |     |     |     */

Zend/zend_inheritance.c

@@ -1588,7 +1588,7 @@ ZEND_API void zend_do_inheritance_ex(zend_class_entry *ce, zend_class_entry *par
 			ce->ce_flags |= ZEND_ACC_EXPLICIT_ABSTRACT_CLASS;
 		}
 	}
-	ce->ce_flags |= parent_ce->ce_flags & (ZEND_HAS_STATIC_IN_METHODS | ZEND_ACC_HAS_TYPE_HINTS | ZEND_ACC_USE_GUARDS | ZEND_ACC_NOT_SERIALIZABLE);
+	ce->ce_flags |= parent_ce->ce_flags & (ZEND_HAS_STATIC_IN_METHODS | ZEND_ACC_HAS_TYPE_HINTS | ZEND_ACC_USE_GUARDS | ZEND_ACC_NOT_SERIALIZABLE | ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES);
 }
 /* }}} */
 

Zend/zend_object_handlers.c

@@ -277,6 +277,12 @@ static ZEND_COLD zend_never_inline void zend_forbidden_dynamic_property(
 		ZSTR_VAL(ce->name), ZSTR_VAL(member));
 }
 
+static ZEND_COLD zend_never_inline void zend_deprecated_dynamic_property(
+		zend_class_entry *ce, zend_string *member) {
+	zend_error(E_DEPRECATED, "Creation of dynamic property %s::$%s is deprecated",
+		ZSTR_VAL(ce->name), ZSTR_VAL(member));
+}
+
 static ZEND_COLD zend_never_inline void zend_readonly_property_modification_scope_error(
 		zend_class_entry *ce, zend_string *member, zend_class_entry *scope, const char *operation) {
 	zend_throw_error(NULL, "Cannot %s readonly property %s::$%s from %s%s",
@@ -874,6 +880,9 @@ write_std_property:
 				variable_ptr = &EG(error_zval);
 				goto exit;
 			}
+			if (UNEXPECTED(!(zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES))) {
+				zend_deprecated_dynamic_property(zobj->ce, name);
+			}
 
 			Z_TRY_ADDREF_P(value);
 			if (!zobj->properties) {
@@ -1050,6 +1059,9 @@ ZEND_API zval *zend_std_get_property_ptr_ptr(zend_object *zobj, zend_string *nam
 				zend_forbidden_dynamic_property(zobj->ce, name);
 				return &EG(error_zval);
 			}
+			if (UNEXPECTED(!(zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES))) {
+				zend_deprecated_dynamic_property(zobj->ce, name);
+			}
 			if (UNEXPECTED(!zobj->properties)) {
 				rebuild_object_properties(zobj);
 			}

Zend/zend_vm_def.h

@@ -2422,7 +2422,7 @@ ZEND_VM_C_LABEL(fast_assign_obj):
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}

Zend/zend_vm_execute.h

@@ -22924,7 +22924,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -23055,7 +23055,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -23186,7 +23186,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -23317,7 +23317,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -25482,7 +25482,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -25613,7 +25613,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -25744,7 +25744,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -25875,7 +25875,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -29407,7 +29407,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -29538,7 +29538,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -29669,7 +29669,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -29800,7 +29800,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -31862,7 +31862,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -31993,7 +31993,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -32124,7 +32124,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -32255,7 +32255,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -33724,7 +33724,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -33855,7 +33855,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -33986,7 +33986,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -34117,7 +34117,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -36203,7 +36203,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -36334,7 +36334,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -36465,7 +36465,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -36596,7 +36596,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -40346,7 +40346,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -40477,7 +40477,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -40608,7 +40608,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -40739,7 +40739,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -43986,7 +43986,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -44117,7 +44117,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -44248,7 +44248,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -44379,7 +44379,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -49028,7 +49028,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -49159,7 +49159,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -49290,7 +49290,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}
@@ -49421,7 +49421,7 @@ fast_assign_obj:
 					}
 				}
 
-				if (!zobj->ce->__set) {
+				if (!zobj->ce->__set && (zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES)) {
 					if (EXPECTED(zobj->properties == NULL)) {
 						rebuild_object_properties(zobj);
 					}

ext/date/tests/DateTimeZone_clone_basic3.phpt

@@ -37,6 +37,10 @@ object(DateTimeZone)#%d (2) {
 }
 
 -- Add some properties --
+
+Deprecated: Creation of dynamic property DateTimeZone::$property1 is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property DateTimeZone::$property2 is deprecated in %s on line %d
 object(DateTimeZone)#%d (4) {
   ["property1"]=>
   int(99)
@@ -61,6 +65,10 @@ object(DateTimeZone)#%d (4) {
 }
 
 -- Add some more properties --
+
+Deprecated: Creation of dynamic property DateTimeZone::$property3 is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property DateTimeZone::$property4 is deprecated in %s on line %d
 object(DateTimeZone)#%d (6) {
   ["property1"]=>
   int(99)

ext/date/tests/DateTime_clone_basic3.phpt

@@ -39,6 +39,10 @@ object(DateTime)#%d (3) {
 }
 
 -- Add some properties --
+
+Deprecated: Creation of dynamic property DateTime::$property1 is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property DateTime::$property2 is deprecated in %s on line %d
 object(DateTime)#%d (5) {
   ["property1"]=>
   int(99)
@@ -67,6 +71,10 @@ object(DateTime)#%d (5) {
 }
 
 -- Add some more properties --
+
+Deprecated: Creation of dynamic property DateTime::$property3 is deprecated in %s on line %d
+
+Deprecated: Creation of dynamic property DateTime::$property4 is deprecated in %s on line %d
 object(DateTime)#%d (7) {
   ["property1"]=>
   int(99)

ext/date/tests/bug65672.phpt

@@ -32,7 +32,7 @@ $period->dynamic3[] = "array";
 var_dump($period->dynamic3);
 
 ?>
---EXPECT--
+--EXPECTF--
 string(5) "stuff"
 string(8) "modified"
 array(1) {
@@ -40,11 +40,17 @@ array(1) {
   string(5) "array"
 }
 bool(false)
+
+Deprecated: Creation of dynamic property DatePeriod@anonymous::$dynamic1 is deprecated in %s on line %d
 string(7) "dynamic"
+
+Deprecated: Creation of dynamic property DatePeriod@anonymous::$dynamic2 is deprecated in %s on line %d
 array(1) {
   [0]=>
   string(5) "array"
 }
+
+Deprecated: Creation of dynamic property DatePeriod@anonymous::$dynamic3 is deprecated in %s on line %d
 array(1) {
   [0]=>
   string(5) "array"

ext/date/tests/call_function_from_method.phpt

@@ -6,6 +6,8 @@ date.timezone=UTC
 <?php
 
 class Date {
+    public $date;
+
     public function __construct($in) {
         $this->date = date_create($in);
     }

ext/date/tests/date_interval_prop_dim.phpt

@@ -12,5 +12,6 @@ while ($i < 1026) {
 }
 ?>
 ==NOCRASH==
---EXPECT--
+--EXPECTF--
+Deprecated: Creation of dynamic property Z::$prop is deprecated in %s on line %d
 ==NOCRASH==

ext/dom/tests/domobject_debug_handler.phpt

@@ -15,6 +15,7 @@ $d->loadXML($xml);
 print_r($d);
 ?>
 --EXPECTF--
+Deprecated: Creation of dynamic property DOMDocument::$dynamicProperty is deprecated in %s on line %d
 DOMDocument Object
 (
     [config] => 

ext/exif/tests/bug68799.phpt

@@ -8,6 +8,7 @@ exif
 * Pollute the heap. Helps trigger bug. Sometimes not needed.
 */
 class A {
+    public $a;
     function __construct() {
         $a = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAa';
         $this->a = $a . $a . $a . $a . $a . $a;

ext/gmp/tests/serialize.phpt

@@ -51,6 +51,8 @@ object(GMP)#%d (1) {
   ["num"]=>
   string(2) "42"
 }
+
+Deprecated: Creation of dynamic property GMP::$foo is deprecated in %s on line %d
 string(56) "O:3:"GMP":2:{i:0;s:1:"d";i:1;a:1:{s:3:"foo";s:3:"bar";}}"
 object(GMP)#%d (2) {
   ["foo"]=>

ext/json/tests/bug42785.phpt

@@ -15,8 +15,7 @@ setlocale(LC_ALL, "de_DE", "de", "german", "ge", "de_DE.ISO8859-1", "ISO8859-1")
 $foo = array(100.10,"bar");
 var_dump(json_encode($foo));
 
-class bar {}
+$bar1 = new stdClass;
-$bar1 = new bar;
 $bar1->a = 100.10;
 $bar1->b = "foo";
 var_dump(json_encode($bar1));

ext/json/tests/json_encode_basic.phpt

@@ -12,10 +12,7 @@ unset ($unset_var);
 $fp = fopen(__FILE__, "r");
 
 // get an object
-class sample  {
+$obj = new stdClass();
-}
-
-$obj = new sample();
 $obj->MyInt = 99;
 $obj->MyFloat = 123.45;
 $obj->MyBool = true;

ext/json/tests/json_encode_pretty_print2.phpt

@@ -2,6 +2,7 @@
 json_encode() with JSON_PRETTY_PRINT on declared properties
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class MyClass {
     public $x;
     public $y;

ext/libxml/tests/bug61367-read.phpt

@@ -14,6 +14,7 @@ open_basedir=.
  * Note: Using error_reporting=E_ALL & ~E_NOTICE to suppress "Trying to get property of non-object" notices.
  */
 class StreamExploiter {
+    public $context;
     public function stream_close (  ) {
         $doc = new DOMDocument;
         $doc->resolveExternals = true;

ext/libxml/tests/bug61367-read_2.phpt

@@ -14,6 +14,8 @@ open_basedir=.
  * Note: Using error_reporting=E_ALL & ~E_NOTICE to suppress "Trying to get property of non-object" notices.
  */
 class StreamExploiter {
+    public $context;
+
     public function stream_close (  ) {
         $doc = new DOMDocument;
         $doc->resolveExternals = true;

ext/libxml/tests/bug61367-write.phpt

@@ -8,6 +8,8 @@ open_basedir=.
 <?php
 
 class StreamExploiter {
+    public $context;
+
     public function stream_close (  ) {
         $doc = new DOMDocument;
         $doc->appendChild($doc->createTextNode('hello'));

ext/mysqli/tests/bug46614.phpt

@@ -13,6 +13,7 @@ if (!defined("MYSQLI_ASYNC")) {
 <?php
 class MySQL_Ext extends mysqli{
     protected $fooData = array();
+    private $extData;
 
     public function isEmpty()
     {

ext/mysqli/tests/mysqli_fetch_object.phpt

@@ -24,7 +24,8 @@ require_once('skipifconnectfailure.inc');
     }
 
     class mysqli_fetch_object_test {
-
+        public $ID;
+        public $label;
         public $a = null;
         public $b = null;
 

ext/mysqli/tests/mysqli_fetch_object_no_constructor.phpt

@@ -19,7 +19,8 @@ require_once('skipifconnectfailure.inc');
     }
 
     class mysqli_fetch_object_test {
-
+        public $ID;
+        public $label;
         public $a = null;
         public $b = null;
 
@@ -51,6 +52,10 @@ require_once('skipifconnectfailure.inc');
 --EXPECTF--
 No exception with PHP:
 object(mysqli_fetch_object_test)#%d (%d) {
+  ["ID"]=>
+  NULL
+  ["label"]=>
+  NULL
   ["a"]=>
   NULL
   ["b"]=>

ext/mysqli/tests/mysqli_fetch_object_oo.phpt

@@ -49,7 +49,8 @@ require_once('skipifconnectfailure.inc');
     }
 
     class mysqli_fetch_object_test {
-
+        public $ID;
+        public $label;
         public $a = null;
         public $b = null;
 

ext/opcache/tests/jit/fetch_obj_003.phpt

@@ -9,6 +9,7 @@ opcache.jit_buffer_size=1M
 opcache
 --FILE--
 <?php
+#[ALlowDynamicProperties]
 class C {
     var $a = 0;
 }

ext/opcache/tests/jit/fetch_obj_004.phpt

@@ -9,6 +9,7 @@ opcache.jit_buffer_size=1M
 opcache
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class C {
     var $a = 0;
 }

ext/opcache/tests/jit/inc_obj_002.phpt

@@ -8,6 +8,7 @@ opcache.jit_buffer_size=1M
 opcache.protect_memory=1
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class Test {
     function foo() {
         $this->prop = PHP_INT_MAX - 5;

ext/opcache/tests/opt/dce_005.phpt

@@ -10,6 +10,7 @@ opcache.preload=
 opcache
 --FILE--
 <?php
+#[AllowDynamicProperties]
 class A {
 }
 function foo(int $x) {
@@ -21,12 +22,12 @@ function foo(int $x) {
 $_main:
      ; (lines=1, args=0, vars=0, tmps=0)
      ; (after optimizer)
-     ; %sdce_005.php:1-9
+     ; %s
 0000 RETURN int(1)
 
 foo:
      ; (lines=2, args=1, vars=1, tmps=0)
      ; (after optimizer)
-     ; %sdce_005.php:4-7
+     ; %s
 0000 CV0($x) = RECV 1
 0001 RETURN null

ext/pdo/tests/pdo_005.phpt

@@ -29,6 +29,7 @@ class TestBase
     private $val2;
 }
 
+#[AllowDynamicProperties] // $val2 will be dynamic now.
 class TestDerived extends TestBase
 {
     protected $row;

ext/pdo/tests/pdo_009.phpt

@@ -29,6 +29,9 @@ $stmt = $db->prepare('SELECT classtypes.name, test.id AS id, test.val AS val FRO
 
 class Test1
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";
@@ -37,6 +40,9 @@ class Test1
 
 class Test2
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";
@@ -45,6 +51,9 @@ class Test2
 
 class Test3
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";

ext/pdo/tests/pdo_010.phpt

@@ -29,6 +29,9 @@ $stmt = $db->prepare('SELECT classtypes.name, test.grp AS grp, test.id AS id, te
 
 class Test1
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";
@@ -37,6 +40,9 @@ class Test1
 
 class Test2
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";
@@ -45,6 +51,9 @@ class Test2
 
 class Test3
 {
+    public $id;
+    public $val;
+
     public function __construct()
     {
         echo __METHOD__ . "()\n";

ext/pdo/tests/pdo_011.phpt

@@ -23,9 +23,8 @@ $db->exec('INSERT INTO test VALUES(4, \'D\', \'Group2\')');
 
 class DerivedStatement extends PDOStatement
 {
-    private function __construct($name, $db)
+    private function __construct(public $name, $db)
     {
-        $this->name = $name;
         echo __METHOD__ . "($name)\n";
     }
 
@@ -41,11 +40,9 @@ $derived = $db->prepare('SELECT id, val FROM test', array(PDO::ATTR_STATEMENT_CL
 
 class Test1
 {
-    public function __construct($id, $val)
+    public function __construct(public $id, public $val)
     {
         echo __METHOD__ . "($id,$val)\n";
-        $this->id = $id;
-        $this->val = $val;
     }
 
     static public function factory($id, $val)

ext/pdo/tests/pdo_012.phpt

@@ -26,6 +26,9 @@ var_dump($stmt->fetchAll());
 
 class Test
 {
+    public $val;
+    public $grp;
+
     function __construct($name = 'N/A')
     {
         echo __METHOD__ . "($name)\n";

ext/pdo/tests/pdo_013.phpt

@@ -32,6 +32,9 @@ foreach ($stmt as $data)
 
 class Test
 {
+    public $val;
+    public $grp;
+
     function __construct($name = 'N/A')
     {
         echo __METHOD__ . "($name)\n";

ext/pdo/tests/pdo_014.phpt

@@ -22,6 +22,9 @@ $SELECT = 'SELECT val, grp FROM test';
 
 class Test
 {
+    public $val;
+    public $grp;
+
     function __construct($name = 'N/A')
     {
         echo __METHOD__ . "($name)\n";

ext/pdo/tests/pdo_023.phpt

@@ -14,6 +14,7 @@ PDOTest::skip();
 if (getenv('REDIR_TEST_DIR') === false) putenv('REDIR_TEST_DIR='.__DIR__ . '/../../pdo/tests/');
 require_once getenv('REDIR_TEST_DIR') . 'pdo_test.inc';
 
+#[AllowDynamicProperties]
 class PDOStatementX extends PDOStatement
 {
     public $test1 = 1;
@@ -31,6 +32,7 @@ class PDOStatementX extends PDOStatement
     }
 }
 
+#[AllowDynamicProperties]
 class PDODatabaseX extends PDO
 {
     public $test1 = 1;

ext/pdo_mysql/tests/bug46292.phpt

@@ -15,6 +15,8 @@ MySQLPDOTest::skip();
 
 
     class myclass {
+        public $value;
+
         public function __construct() {
             printf("%s()\n", __METHOD__);
         }

ext/pdo_mysql/tests/bug63176.phpt

@@ -20,6 +20,7 @@ class PDO3 extends PDO {
 
 
 class ModelA {
+    public $db;
     public function __construct($h) {
         var_dump($h);
         if ($h) {

ext/pdo_mysql/tests/bug70862.phpt

@@ -19,6 +19,7 @@ MySQLPDOTest::skip();
     $db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, true);
 
     class HelloWrapper {
+        public $context;
         public function stream_open() { return true; }
         public function stream_eof() { return true; }
         public function stream_read() { return NULL; }

ext/pdo_mysql/tests/pdo_mysql_stmt_fetch_serialize.phpt

@@ -14,6 +14,7 @@ MySQLPDOTest::skip();
 
     try {
 
+        #[AllowDynamicProperties]
         class myclass implements Serializable {
 
             private static $instance = null;

ext/pdo_mysql/tests/pdo_mysql_stmt_fetchobject.phpt

@@ -30,6 +30,7 @@ try {
     $query = "SELECT id, '', NULL, \"\" FROM test ORDER BY id ASC LIMIT 3";
     $stmt = $db->prepare($query);
 
+    #[AllowDynamicProperties]
     class myclass {
 
         private $set_calls = 0;

ext/pdo_pgsql/tests/bug72294.phpt

@@ -70,6 +70,8 @@ class PHPUnit_Framework_TestFailure
 
 class PHPUnit_Framework_TestResult
 {
+    private $errors;
+
     public function run( $test)
     {
         $error      = false;

ext/pdo_sqlite/tests/bug46139.phpt

@@ -8,6 +8,7 @@ pdo_sqlite
 require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
 $db = PDOTest::test_factory(__DIR__ . '/common.phpt');
 
+#[AllowDynamicProperties]
 class Person {
     public $test = NULL;
     public function __construct() {

ext/pdo_sqlite/tests/bug70862.phpt

@@ -14,6 +14,7 @@ $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, 0);
 $db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, true);
 
 class HelloWrapper {
+    public $context;
     public function stream_open() { return true; }
     public function stream_eof() { return true; }
     public function stream_read() { return NULL; }