How to get the included file variable in a class method?

Question

PHP

You need to do a little automation in the browser. To do this, I need to connect the
index.php file with a request to the api to get the numbers of all invoices for which I need to make a newsletter.
In the index.php file, the variable $orderDatareturns an array of numbers.
When the index.php file is included in a class method, the browser closes immediately, ignoring all subsequent wait calls.

<?php

class SigninCest
{
    public function signIn(AcceptanceTester $I)
    {
        $I->amOnUrl(myUrl);
        $I->fillField('username','user');
        $I->fillField('passwd','password');
        $I->click('.login-button');
        $I->waitForElement('el', 5);
         require_once 'index.php'; //браузер сразу закрывается
        $arrNums = new moyscladQuery();
        $arrNum = $arrNums->getQuery();
        $I->fillField('text_search', $arrNum);
        $I->wait(3);
    }

}

class moyscladQuery
{
    public function getQuery () {
        //...api request
        return $orderData;
    }
}