public function actionUpdateprice()
 {
     $creator = new ExcelCreator();
     if ($creator->createExcelFile('price.xlsx')) {
         echo 'Прайс успешно обновлен';
     }
 }
<?php

require_once 'GithubIssue.php';
require_once 'ExcelCreator.php';
$issue = new GithubIssue('{owner}', '{repo}', '{user}', '{token}');
$data = $issue->process();
$ec = new ExcelCreator($data);
$ec->generate();