Deprecate partially supported callables

This deprecates all callables that are accepted by
call_user_func($callable) but not by $callable(). In particular:

    "self::method"
    "parent::method"
    "static::method"
    ["self", "method"]
    ["parent", "method"]
    ["static", "method"]
    ["Foo", "Bar::method"]
    [new Foo, "Bar::method"]

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

Closes GH-7446.

UPGRADING

@@ -35,6 +35,26 @@ PHP 8.2 UPGRADE NOTES
 4. Deprecated Functionality
 ========================================
 
+- Core:
+  . Callables that are not accepted by the $callable() syntax (but are accepted
+    by call_user_func) are deprecated. In particular:
+
+        "self::method"
+        "parent::method"
+        "static::method"
+        ["self", "method"]
+        ["parent", "method"]
+        ["static", "method"]
+        ["Foo", "Bar::method"]
+        [new Foo, "Bar::method"]
+
+    This does not affect normal method callables like "A::method" or
+    ["A", "method"]. A deprecation notice is only emitted on call. Both
+    is_callable() and the callable type will silently accept these callables
+    until support for them is removed entirely.
+
+    RFC: https://wiki.php.net/rfc/deprecate_partially_supported_callables
+
 ========================================
 5. Changed Functions
 ========================================

Zend/tests/bug37138.phpt

@@ -14,7 +14,11 @@ st::e ();
 st::e2 ();
 stch::g ();
 ?>
---EXPECT--
+--EXPECTF--
 EHLO
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 EHLO
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 EHLO

Zend/tests/bug41026.phpt

@@ -20,6 +20,7 @@ try_class::main ();
 
 echo "Done\n";
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 Done
 CHECKPOINT

Zend/tests/bug45186.phpt

@@ -38,7 +38,7 @@ try {
 }
 
 ?>
---EXPECT--
+--EXPECTF--
 __call:
 string(3) "ABC"
 __call:
@@ -47,8 +47,12 @@ __call:
 string(3) "xyz"
 __call:
 string(3) "www"
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 __call:
 string(1) "y"
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 __call:
 string(1) "y"
 ok

Zend/tests/bug45186_2.phpt

@@ -38,7 +38,7 @@ try {
 }
 
 ?>
---EXPECT--
+--EXPECTF--
 __call:
 string(3) "ABC"
 __call:
@@ -47,8 +47,12 @@ __call:
 string(3) "xyz"
 __call:
 string(3) "www"
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 __call:
 string(1) "y"
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 __call:
 string(1) "y"
 ok

Zend/tests/bug48770.phpt

@@ -30,5 +30,6 @@ $c = new C;
 $c->callFuncInParent('Which function will be called??');
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Callables of the form ["C", "parent::func"] are deprecated in %s on line %d
 B::func called

Zend/tests/bug48770_2.phpt

@@ -53,8 +53,15 @@ $c = new C;
 $c->func('This should work!');
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Callables of the form ["C", "parent::func2"] are deprecated in %s on line %d
 string(27) "B::func2: This should work!"
+
+Deprecated: Callables of the form ["C", "parent::func3"] are deprecated in %s on line %d
 string(27) "B::func3: This should work!"
+
+Deprecated: Callables of the form ["C", "parent::func22"] are deprecated in %s on line %d
 call_user_func_array(): Argument #1 ($callback) must be a valid callback, cannot access private method B::func22()
+
+Deprecated: Callables of the form ["C", "parent::inexistent"] are deprecated in %s on line %d
 call_user_func_array(): Argument #1 ($callback) must be a valid callback, class B does not have a method "inexistent"

Zend/tests/bug48770_3.phpt

@@ -44,7 +44,12 @@ $c = new C;
 $c->func('This should work!');
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Callables of the form ["C", "self::func2"] are deprecated in %s on line %d
 string(27) "B::func2: This should work!"
+
+Deprecated: Callables of the form ["C", "self::func3"] are deprecated in %s on line %d
 string(27) "B::func3: This should work!"
+
+Deprecated: Callables of the form ["C", "self::inexistent"] are deprecated in %s on line %d
 call_user_func_array(): Argument #1 ($callback) must be a valid callback, class C does not have a method "inexistent"

Zend/tests/bug66719.phpt

@@ -34,10 +34,14 @@ call_user_func(array(B::class, 'parent::who'));
 C::test();
 
 ?>
---EXPECT--
+--EXPECTF--
 string(1) "B"
 string(1) "A"
+
+Deprecated: Callables of the form ["B", "parent::who"] are deprecated in %s on line %d
 string(1) "A"
 string(1) "B"
 string(1) "A"
+
+Deprecated: Callables of the form ["B", "parent::who"] are deprecated in %s on line %d
 string(1) "A"

Zend/tests/bug78770.phpt

@@ -19,5 +19,6 @@ class Test {
 
 ?>
 ===DONE===
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 ===DONE===

Zend/tests/bug78898.phpt

@@ -30,5 +30,9 @@ $b = new B;
 $b->x();
 
 ?>
---EXPECT--
-aaa
+--EXPECTF--
+a
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+a
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+a

Zend/tests/callable_self_parent_static_deprecation.phpt

@@ -0,0 +1,69 @@
+--TEST--
+Deprecation of self/parent/static in callables
+--FILE--
+<?php
+
+class A {
+    public function foo() {}
+}
+class B extends A {
+    public function test() {
+        // Different callables using self/parent/static
+        echo "Test different callables\n";
+        call_user_func("self::foo");
+        call_user_func("parent::foo");
+        call_user_func("static::foo");
+        call_user_func(["self", "foo"]);
+        call_user_func(["parent", "foo"]);
+        call_user_func(["static", "foo"]);
+        call_user_func(["B", "self::foo"]);
+        call_user_func(["B", "parent::foo"]);
+        call_user_func(["B", "static::foo"]);
+        call_user_func(["B", "A::foo"]);
+
+        // Also applies to other things performing calls
+        echo "Test array_map()\n";
+        array_map("self::foo", [1]);
+
+        echo "Test is_callable() -- should be silent\n";
+        var_dump(is_callable("self::foo"));
+
+        echo "Test callable type hint -- should be silent\n";
+        $this->callableTypeHint("self::foo");
+    }
+
+    public function callableTypeHint(callable $c) {}
+}
+
+$b = new B;
+$b->test();
+
+?>
+--EXPECTF--
+Test different callables
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
+
+Deprecated: Callables of the form ["B", "self::foo"] are deprecated in %s on line %d
+
+Deprecated: Callables of the form ["B", "parent::foo"] are deprecated in %s on line %d
+
+Deprecated: Callables of the form ["B", "static::foo"] are deprecated in %s on line %d
+
+Deprecated: Callables of the form ["B", "A::foo"] are deprecated in %s on line %d
+Test array_map()
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+Test is_callable() -- should be silent
+bool(true)
+Test callable type hint -- should be silent

Zend/tests/closures/closure_from_callable_basic.phpt

@@ -96,7 +96,7 @@ echo $fn(" OK".PHP_EOL);
 
 
 ?>
---EXPECT--
+--EXPECTF--
 Access public static function OK
 Access public static function with different case OK
 Access public static function with colon scheme OK
@@ -111,9 +111,17 @@ Instance return private static method as callable OK
 Instance return protected static method as callable OK
 Subclass closure over parent class protected method OK
 Subclass closure over parent class static protected method OK
-Access public instance method of parent object through "parent::"  OK
-Access public instance method of self object through "self::"  OK
-Access public instance method of parent object through "self::" to parent method OK
-Access protected instance method of parent object through "self::" to parent method OK
+Access public instance method of parent object through "parent::" 
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+ OK
+Access public instance method of self object through "self::" 
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+ OK
+Access public instance method of parent object through "self::" to parent method
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+ OK
+Access protected instance method of parent object through "self::" to parent method
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+ OK
 MagicCall __call instance method __call,nonExistentMethod, OK
 MagicCall __callStatic static method __callStatic,nonExistentMethod, OK

Zend/tests/closures/closure_from_callable_error.phpt

@@ -193,7 +193,7 @@ catch (\Throwable $t) {
 echo "OK\n";
 
 ?>
---EXPECT--
+--EXPECTF--
 Cannot access privateInstance method statically
 Cannot access privateInstance method statically with colon scheme
 Cannot access privateInstance method
@@ -209,4 +209,6 @@ Subclass cannot closure over parant private static method
 Function scope cannot closure over protected instance method
 Function scope cannot closure over private instance method
 Access private instance method of parent object through "self::" to parent method
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 OK

Zend/tests/lsb_011.phpt

@@ -19,5 +19,6 @@ class Test2 extends Test1 {
 }
 Test2::test();
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 ok

Zend/tests/lsb_012.phpt

@@ -19,5 +19,6 @@ class Test2 extends Test1 {
 }
 Test2::test();
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 ok

Zend/tests/lsb_021.phpt

@@ -39,12 +39,20 @@ C::testForward();
 C::testNoForward();
 
 ?>
---EXPECT--
-C
-C
+--EXPECTF--
+C
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+C
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 C
 C
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 C
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 C
 A
 A

Zend/tests/lsb_022.phpt

@@ -24,9 +24,24 @@ class B extends A {
 }
 B::foo();
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "static" in callables is deprecated in %s on line %d
 B

Zend/zend_API.c

@@ -3291,7 +3291,7 @@ static zend_always_inline zend_class_entry *get_scope(zend_execute_data *frame)
 	return frame && frame->func ? frame->func->common.scope : NULL;
 }
 
-static bool zend_is_callable_check_class(zend_string *name, zend_class_entry *scope, zend_execute_data *frame, zend_fcall_info_cache *fcc, bool *strict_class, char **error) /* {{{ */
+static bool zend_is_callable_check_class(zend_string *name, zend_class_entry *scope, zend_execute_data *frame, zend_fcall_info_cache *fcc, bool *strict_class, char **error, bool suppress_deprecation) /* {{{ */
 {
 	bool ret = 0;
 	zend_class_entry *ce;
@@ -3307,6 +3307,9 @@ static bool zend_is_callable_check_class(zend_string *name, zend_class_entry *sc
 		if (!scope) {
 			if (error) *error = estrdup("cannot access \"self\" when no class scope is active");
 		} else {
+			if (error && !suppress_deprecation) {
+				zend_error(E_DEPRECATED, "Use of \"self\" in callables is deprecated");
+			}
 			fcc->called_scope = zend_get_called_scope(frame);
 			if (!fcc->called_scope || !instanceof_function(fcc->called_scope, scope)) {
 				fcc->called_scope = scope;
@@ -3323,6 +3326,9 @@ static bool zend_is_callable_check_class(zend_string *name, zend_class_entry *sc
 		} else if (!scope->parent) {
 			if (error) *error = estrdup("cannot access \"parent\" when current class scope has no parent");
 		} else {
+			if (error && !suppress_deprecation) {
+				zend_error(E_DEPRECATED, "Use of \"parent\" in callables is deprecated");
+			}
 			fcc->called_scope = zend_get_called_scope(frame);
 			if (!fcc->called_scope || !instanceof_function(fcc->called_scope, scope->parent)) {
 				fcc->called_scope = scope->parent;
@@ -3340,6 +3346,9 @@ static bool zend_is_callable_check_class(zend_string *name, zend_class_entry *sc
 		if (!called_scope) {
 			if (error) *error = estrdup("cannot access \"static\" when no class scope is active");
 		} else {
+			if (error && !suppress_deprecation) {
+				zend_error(E_DEPRECATED, "Use of \"static\" in callables is deprecated");
+			}
 			fcc->called_scope = called_scope;
 			fcc->calling_scope = called_scope;
 			if (!fcc->object) {
@@ -3472,7 +3481,7 @@ static zend_always_inline bool zend_is_callable_check_func(int check_flags, zval
 				fcc->called_scope = fcc->object ? fcc->object->ce : fcc->calling_scope;
 			}
 			strict_class = 1;
-		} else if (!zend_is_callable_check_class(cname, scope, frame, fcc, &strict_class, error)) {
+		} else if (!zend_is_callable_check_class(cname, scope, frame, fcc, &strict_class, error, ce_org != NULL)) {
 			zend_string_release_ex(cname, 0);
 			return 0;
 		}
@@ -3483,6 +3492,11 @@ static zend_always_inline bool zend_is_callable_check_func(int check_flags, zval
 			if (error) zend_spprintf(error, 0, "class %s is not a subclass of %s", ZSTR_VAL(ce_org->name), ZSTR_VAL(fcc->calling_scope->name));
 			return 0;
 		}
+		if (ce_org && error) {
+			zend_error(E_DEPRECATED,
+				"Callables of the form [\"%s\", \"%s\"] are deprecated",
+				ZSTR_VAL(ce_org->name), Z_STRVAL_P(callable));
+		}
 		mname = zend_string_init(Z_STRVAL_P(callable) + clen + 2, mlen, 0);
 	} else if (ce_org) {
 		/* Try to fetch find static method of given class. */
@@ -3756,7 +3770,7 @@ check_func:
 						return 1;
 					}
 
-					if (!zend_is_callable_check_class(Z_STR_P(obj), get_scope(frame), frame, fcc, &strict_class, error)) {
+					if (!zend_is_callable_check_class(Z_STR_P(obj), get_scope(frame), frame, fcc, &strict_class, error, false)) {
 						return 0;
 					}
 				} else {

ext/pdo_mysql/tests/pdo_mysql_subclass.phpt

@@ -78,6 +78,8 @@ $db->exec('DROP TABLE IF EXISTS test');
 ?>
 --EXPECTF--
 __construct('%S', '%S', %s)
+
+Deprecated: Callables of the form ["MyPDO", "parent::__construct"] are deprecated in %s on line %d
 exec('DROP TABLE IF EXISTS test')
 exec('CREATE TABLE test(id INT)')
 exec('INSERT INTO test(id) VALUES (1), (2)')

ext/pdo_sqlite/tests/pdo_fetch_func_001.phpt

@@ -126,6 +126,8 @@ function "" not found or invalid function name
 PDOStatement::fetchAll(): Argument #2 must be a callable, null given
 no array or string given
 cannot access "self" when no class scope is active
+
+Deprecated: Callables of the form ["bar", "parent::method"] are deprecated in %s on line %d
 array(2) {
   [0]=>
   string(9) "--- 1 ---"

ext/spl/tests/bug65006.phpt

@@ -22,7 +22,10 @@ second::init();
 var_dump(spl_autoload_functions());
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 array(2) {
   [0]=>
   array(2) {

ext/standard/tests/class_object/forward_static_call_001.phpt

@@ -57,14 +57,20 @@ echo "-\n";
 C::test3();
 
 ?>
---EXPECT--
+--EXPECTF--
 A
 -
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 B
 -
 B
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 B
 -
 B
@@ -74,7 +80,11 @@ C
 C
 -
 B
+
+Deprecated: Use of "self" in callables is deprecated in %s on line %d
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 C
 -
 B

ext/standard/tests/class_object/forward_static_call_003.phpt

@@ -38,12 +38,16 @@ echo "-\n";
 C::test();
 
 ?>
---EXPECT--
+--EXPECTF--
 A
 -
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 B
 -
 C
 B
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 B

ext/standard/tests/general_functions/bug40398.phpt

@@ -73,10 +73,17 @@ new Derived_5('5');
 new Derived_6('6');
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Callables of the form ["Derived_1", "Base::__construct"] are deprecated in %s on line %d
 Base::__construct(1)
+
+Deprecated: Callables of the form ["Derived_2", "parent::__construct"] are deprecated in %s on line %d
 Base::__construct(2)
 Base::__construct(3)
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 Base::__construct(4)
 Base::__construct(5)
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 Base::__construct(6)

ext/standard/tests/general_functions/callbacks_001.phpt

@@ -83,14 +83,22 @@ $o = new P;
 $o->test();
 
 ?>
---EXPECT--
+--EXPECTF--
 parent|who
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 B
 C|parent::who
+
+Deprecated: Callables of the form ["C", "parent::who"] are deprecated in %s on line %d
 B
 B|parent::who
+
+Deprecated: Callables of the form ["B", "parent::who"] are deprecated in %s on line %d
 A
 E|parent::who
+
+Deprecated: Callables of the form ["E", "parent::who"] are deprecated in %s on line %d
 D
 A|who
 A
@@ -100,10 +108,16 @@ B|who2
 A
 ===FOREIGN===
 parent|who
+
+Deprecated: Use of "parent" in callables is deprecated in %s on line %d
 O
 P|parent::who
+
+Deprecated: Callables of the form ["P", "parent::who"] are deprecated in %s on line %d
 O
 $this|O::who
+
+Deprecated: Callables of the form ["P", "O::who"] are deprecated in %s on line %d
 O
 $this|B::who
 call_user_func(): Argument #1 ($callback) must be a valid callback, class P is not a subclass of B

tests/classes/abstract_user_call.phpt

@@ -27,6 +27,8 @@ try {
 }
 
 ?>
---EXPECT--
+--EXPECTF--
 test::func()
+
+Deprecated: Callables of the form ["test", "test_base::func"] are deprecated in %s on line %d
 call_user_func(): Argument #1 ($callback) must be a valid callback, cannot call abstract method test_base::func()