Specify get_property_ptr_ptr handler for DatePeriod

This handler is required on 7.4. Just return NULL from it to fall
back to read_property.

Author: nikic

ext/date/php_date.c

@@ -662,6 +662,7 @@ static zval *date_interval_write_property(zval *object, zval *member, zval *valu
 static zval *date_interval_get_property_ptr_ptr(zval *object, zval *member, int type, void **cache_slot);
 static zval *date_period_read_property(zval *object, zval *member, int type, void **cache_slot, zval *rv);
 static zval *date_period_write_property(zval *object, zval *member, zval *value, void **cache_slot);
+static zval *date_period_get_property_ptr_ptr(zval *object, zval *member, int type, void **cache_slot);
 
 /* {{{ Module struct */
 zend_module_entry date_module_entry = {
@@ -2178,7 +2179,7 @@ static void date_register_classes(void) /* {{{ */
 	date_object_handlers_period.free_obj = date_object_free_storage_period;
 	date_object_handlers_period.clone_obj = date_object_clone_period;
 	date_object_handlers_period.get_properties = date_object_get_properties_period;
-	date_object_handlers_period.get_property_ptr_ptr = NULL;
+	date_object_handlers_period.get_property_ptr_ptr = date_period_get_property_ptr_ptr;
 	date_object_handlers_period.get_gc = date_object_get_gc_period;
 	date_object_handlers_period.read_property = date_period_read_property;
 	date_object_handlers_period.write_property = date_period_write_property;
@@ -5344,3 +5345,11 @@ static zval *date_period_write_property(zval *object, zval *member, zval *value,
 	return value;
 }
 /* }}} */
+
+/* {{{ date_period_get_property_ptr_ptr */
+static zval *date_period_get_property_ptr_ptr(zval *object, zval *member, int type, void **cache_slot)
+{
+	/* Fall back to read_property handler. */
+	return NULL;
+}
+/* }}} */