[RFC] Add get_error_handler(), get_exception_handler() functions

Zend/tests/get_error_handler.phpt

@@ -0,0 +1,68 @@
+--TEST--
+get_error_handler()
+--FILE--
+<?php
+
+class C {
+    function handle() {}
+    static function handleStatic() {}
+}
+
+function foo() {}
+
+set_error_handler("foo");
+var_dump(get_error_handler());
+
+set_error_handler(null);
+var_dump(get_error_handler());
+
+set_error_handler([C::class, 'handleStatic']);
+var_dump(get_error_handler());
+
+set_error_handler('C::handleStatic');
+var_dump(get_error_handler());
+
+set_error_handler([new C(), 'handle']);
+var_dump(get_error_handler());
+
+set_error_handler((new C())->handle(...));
+var_dump(get_error_handler());
+
+set_error_handler(function () {});
+var_dump(get_error_handler());
+
+?>
+==DONE==
+--EXPECTF--
+string(3) "foo"
+NULL
+array(2) {
+  [0]=>
+  string(1) "C"
+  [1]=>
+  string(12) "handleStatic"
+}
+string(15) "C::handleStatic"
+array(2) {
+  [0]=>
+  object(C)#%d (0) {
+  }
+  [1]=>
+  string(6) "handle"
+}
+object(Closure)#%d (2) {
+  ["function"]=>
+  string(9) "C::handle"
+  ["this"]=>
+  object(C)#%d (0) {
+  }
+}
+object(Closure)#%d (3) {
+  ["name"]=>
+  string(%d) "{closure:%s:%d}"
+  ["file"]=>
+  string(%d) "%s"
+  ["line"]=>
+  int(%d)
+}
+==DONE==

Zend/tests/get_exception_handler.phpt

@@ -0,0 +1,68 @@
+--TEST--
+get_exception_handler()
+--FILE--
+<?php
+
+class C {
+    function handle() {}
+    static function handleStatic() {}
+}
+
+function foo() {}
+
+set_exception_handler("foo");
+var_dump(get_exception_handler());
+
+set_exception_handler(null);
+var_dump(get_exception_handler());
+
+set_exception_handler([C::class, 'handleStatic']);
+var_dump(get_exception_handler());
+
+set_exception_handler('C::handleStatic');
+var_dump(get_exception_handler());
+
+set_exception_handler([new C(), 'handle']);
+var_dump(get_exception_handler());
+
+set_exception_handler((new C())->handle(...));
+var_dump(get_exception_handler());
+
+set_exception_handler(function () {});
+var_dump(get_exception_handler());
+
+?>
+==DONE==
+--EXPECTF--
+string(3) "foo"
+NULL
+array(2) {
+  [0]=>
+  string(1) "C"
+  [1]=>
+  string(12) "handleStatic"
+}
+string(15) "C::handleStatic"
+array(2) {
+  [0]=>
+  object(C)#%d (0) {
+  }
+  [1]=>
+  string(6) "handle"
+}
+object(Closure)#%d (2) {
+  ["function"]=>
+  string(9) "C::handle"
+  ["this"]=>
+  object(C)#%d (0) {
+  }
+}
+object(Closure)#%d (3) {
+  ["name"]=>
+  string(%d) "{closure:%s:%d}"
+  ["file"]=>
+  string(%d) "%s"
+  ["line"]=>
+  int(%d)
+}
+==DONE==

Zend/zend_builtin_functions.c

@@ -1323,6 +1323,15 @@ ZEND_FUNCTION(restore_error_handler)
 }
 /* }}} */
 
+ZEND_FUNCTION(get_error_handler)
+{
+	ZEND_PARSE_PARAMETERS_NONE();
+
+	if (Z_TYPE(EG(user_error_handler)) != IS_UNDEF) {
+		RETURN_ZVAL(&EG(user_error_handler), 1, 0);
+	}
+}
+
 /* {{{ Sets a user-defined exception handler function. Returns the previously defined exception handler, or false on error */
 ZEND_FUNCTION(set_exception_handler)
 {
@@ -1369,6 +1378,15 @@ ZEND_FUNCTION(restore_exception_handler)
 }
 /* }}} */
 
+ZEND_FUNCTION(get_exception_handler)
+{
+	ZEND_PARSE_PARAMETERS_NONE();
+
+	if (Z_TYPE(EG(user_exception_handler)) != IS_UNDEF) {
+		RETURN_ZVAL(&EG(user_exception_handler), 1, 0);
+	}
+}
+
 static inline void get_declared_class_impl(INTERNAL_FUNCTION_PARAMETERS, int flags) /* {{{ */
 {
 	zend_string *key;

Zend/zend_builtin_functions.stub.php

@@ -117,11 +117,15 @@ function set_error_handler(?callable $callback, int $error_levels = E_ALL) {}
 
 function restore_error_handler(): true {}
 
+function get_error_handler(): mixed {}
+
 /** @return callable|null */
 function set_exception_handler(?callable $callback) {}
 
 function restore_exception_handler(): true {}
 
+function get_exception_handler(): mixed {}
+
 /**
  * @return array<int, string>
  * @refcount 1