documentation/_value_source_interface_8php_source.html

 <?php
 namespace Magento\Framework\Data;

 interface ValueSourceInterface
 {
     public function getValue($name);
 }
Magento\Framework\Data
Definition: AbstractCriteria.php:6

Magento\Framework\Data\ValueSourceInterface
Definition: ValueSourceInterface.php:11

Magento\Framework\Data\ValueSourceInterface\getValue
getValue($name)

$name
if(!isset($_GET['name'])) $name
Definition: log.php:14