documentation/_data_persistor_interface_8php_source.html

 <?php
 namespace Magento\Framework\App\Request;

 interface DataPersistorInterface
 {
     public function set($key, $data);

     public function get($key);

     public function clear($key);
 }
Magento\Framework\App\Request\DataPersistorInterface
Definition: DataPersistorInterface.php:12

Magento\Framework\App\Request\DataPersistorInterface\clear
clear($key)

$data
$data
Definition: attribute_set_with_image_attribute.php:16

Magento\Framework\App\Request
Definition: CompositeValidator.php:9