diff --git a/ext/simplexml/simplexml.c b/ext/simplexml/simplexml.c
index 6eae5650340c5..186db442ffa27 100644
--- a/ext/simplexml/simplexml.c
+++ b/ext/simplexml/simplexml.c
@@ -1225,12 +1225,12 @@ static HashTable *sxe_get_properties(zend_object *object) /* {{{ */
 }
 /* }}} */
 
-static HashTable * sxe_get_debug_info(zend_object *object, int *is_temp) /* {{{ */
+/* This custom handler exists because the var_dump adds a pseudo "@attributes" key. */
+PHP_METHOD(SimpleXMLElement, __debugInfo)
 {
-	*is_temp = 1;
-	return sxe_get_prop_hash(object, 1);
+	ZEND_PARSE_PARAMETERS_NONE();
+	RETURN_ARR(sxe_get_prop_hash(Z_OBJ_P(ZEND_THIS), 1));
 }
-/* }}} */
 
 static int sxe_objects_compare(zval *object1, zval *object2) /* {{{ */
 {
@@ -2733,7 +2733,6 @@ PHP_MINIT_FUNCTION(simplexml)
 	sxe_object_handlers.compare = sxe_objects_compare;
 	sxe_object_handlers.cast_object = sxe_object_cast;
 	sxe_object_handlers.count_elements = sxe_count_elements;
-	sxe_object_handlers.get_debug_info = sxe_get_debug_info;
 	sxe_object_handlers.get_closure = NULL;
 	sxe_object_handlers.get_gc = sxe_get_gc;
 
diff --git a/ext/simplexml/simplexml.stub.php b/ext/simplexml/simplexml.stub.php
index 4735573521587..b53730a97aeed 100644
--- a/ext/simplexml/simplexml.stub.php
+++ b/ext/simplexml/simplexml.stub.php
@@ -51,6 +51,8 @@ public function getName(): string {}
 
     public function __toString(): string {}
 
+    public function __debugInfo(): ?array {}
+
     /** @tentative-return-type */
     public function count(): int {}
 
diff --git a/ext/simplexml/simplexml_arginfo.h b/ext/simplexml/simplexml_arginfo.h
index f6100eb243e31..7401ffdb9a41c 100644
--- a/ext/simplexml/simplexml_arginfo.h
+++ b/ext/simplexml/simplexml_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 06c88dc2fb5582a6d21c11aee6ac0a0538e70cbc */
+ * Stub hash: 3da8d1222740f381602c0ec738fe6aa9dca56c8e */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_simplexml_load_file, 0, 1, SimpleXMLElement, MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, filename, IS_STRING, 0)
@@ -79,6 +79,9 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_SimpleXMLElement___toString, 0, 0, IS_STRING, 0)
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_SimpleXMLElement___debugInfo, 0, 0, IS_ARRAY, 1)
+ZEND_END_ARG_INFO()
+
 ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_TYPE_INFO_EX(arginfo_class_SimpleXMLElement_count, 0, 0, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 
@@ -116,6 +119,7 @@ ZEND_METHOD(SimpleXMLElement, addChild);
 ZEND_METHOD(SimpleXMLElement, addAttribute);
 ZEND_METHOD(SimpleXMLElement, getName);
 ZEND_METHOD(SimpleXMLElement, __toString);
+ZEND_METHOD(SimpleXMLElement, __debugInfo);
 ZEND_METHOD(SimpleXMLElement, count);
 ZEND_METHOD(SimpleXMLElement, rewind);
 ZEND_METHOD(SimpleXMLElement, valid);
@@ -148,6 +152,7 @@ static const zend_function_entry class_SimpleXMLElement_methods[] = {
 	ZEND_ME(SimpleXMLElement, addAttribute, arginfo_class_SimpleXMLElement_addAttribute, ZEND_ACC_PUBLIC)
 	ZEND_ME(SimpleXMLElement, getName, arginfo_class_SimpleXMLElement_getName, ZEND_ACC_PUBLIC)
 	ZEND_ME(SimpleXMLElement, __toString, arginfo_class_SimpleXMLElement___toString, ZEND_ACC_PUBLIC)
+	ZEND_ME(SimpleXMLElement, __debugInfo, arginfo_class_SimpleXMLElement___debugInfo, ZEND_ACC_PUBLIC)
 	ZEND_ME(SimpleXMLElement, count, arginfo_class_SimpleXMLElement_count, ZEND_ACC_PUBLIC)
 	ZEND_ME(SimpleXMLElement, rewind, arginfo_class_SimpleXMLElement_rewind, ZEND_ACC_PUBLIC)
 	ZEND_ME(SimpleXMLElement, valid, arginfo_class_SimpleXMLElement_valid, ZEND_ACC_PUBLIC)
diff --git a/ext/simplexml/tests/gh16317.phpt b/ext/simplexml/tests/gh16317.phpt
new file mode 100644
index 0000000000000..db6c88022b19c
--- /dev/null
+++ b/ext/simplexml/tests/gh16317.phpt
@@ -0,0 +1,22 @@
+--TEST--
+GH-16317 (SimpleXML does not allow __debugInfo() overrides to work)
+--FILE--
+<?php
+
+class MySXE extends SimpleXMLElement {
+    public function __debugInfo(): array {
+        echo "invoked\n";
+        return ['x' => 1];
+    }
+}
+
+$sxe = simplexml_load_string('<root><a/></root>', MySXE::class);
+var_dump($sxe);
+
+?>
+--EXPECT--
+invoked
+object(MySXE)#1 (1) {
+  ["x"]=>
+  int(1)
+}