class Input { private $data; public function __construct() { $this->data = $_REQUEST; } public function get($key) { return isset($this->data[$key]) ? $this->data[$key] : null; } }This code creates an Input class that has a private data member which is initialized to the $_REQUEST global variable in the constructor function. The get() function is used to retrieve input data from the object. The package library that may contain this function is the Symfony HTTP Foundation component which provides a set of reusable PHP classes that are used to handle HTTP requests and responses. The Input class is a part of the Symfony component and is used to handle user input validation.