N98\Magento\Command\System\Check\PHP\BytecodeCacheExtensionsCheck::check PHP Method

    public function check(ResultCollection $results)
    {
        $result = $results->createResult();
        $bytecopdeCacheExtensions = $this->_commandConfig['php']['bytecode-cache-extensions'];
        $bytecodeCacheExtensionLoaded = false;
        $bytecodeCacheExtension = null;
        foreach ($bytecopdeCacheExtensions as $ext) {
            if (extension_loaded($ext)) {
                $bytecodeCacheExtension = $ext;
                $bytecodeCacheExtensionLoaded = true;
                break;
            }
        }
        $result->setStatus($bytecodeCacheExtensionLoaded ? Result::STATUS_OK : Result::STATUS_WARNING);
        if ($result->isValid()) {
            $result->setMessage("<info>Bytecode Cache <comment>{$bytecodeCacheExtension}</comment> found.</info>");
        } else {
            $result->setMessage("<error>No Bytecode-Cache found!</error> <comment>It's recommended to install anyone of " . implode(', ', $bytecopdeCacheExtensions) . ".</comment>");
        }
    }