fix #36859 (DOMElement crashes when calling __construct when clone'ing)

Author: tony2001

NEWS

@@ -11,6 +11,8 @@ PHP                                                                        NEWS
 - Removed the E_STRICT deprecation notice from "var". (Ilia)
 - Fixed debug_zval_dump() to support private and protected members. (Dmitry)
 - Fixed SoapFault::getMessage(). (Dmitry)
+- Fixed bug #36859 (DOMElement crashes when calling __construct when 
+  clone'ing). (Tony)
 - Fixed bug #36825 (Exceptions thrown in ArrayObject::offsetGet cause 
   segfault). (Tony)
 - Fixed bug #36820 (Privileged connection with an Oracle password file fails). 

ext/dom/php_dom.c

@@ -443,6 +443,7 @@ zend_object_value dom_objects_store_clone_obj(zval *zobject TSRMLS_DC)
 	retval.handle = zend_objects_store_put(new_object, obj->dtor, obj->free_storage, obj->clone TSRMLS_CC);
 	intern = (dom_object *) new_object;
 	intern->handle = retval.handle;
+	intern->ptr = NULL;
 	retval.handlers = Z_OBJ_HT_P(zobject);
 
 	old_object = (dom_object *) obj->object;