StackFormation\ValueResolver\Stage\EnvironmentVariable::invoke PHP Метод

    public function invoke($string)
    {
        $string = preg_replace_callback('/\\{env:([^:\\}\\{]+?)\\}/', function ($matches) {
            $value = getenv($matches[1]);
            if (!$value) {
                throw new MissingEnvVarException($matches[1]);
            }
            $this->valueResolver->getDependencyTracker()->trackEnvUsage($matches[1], false, $value, $this->sourceBlueprint, $this->sourceType, $this->sourceKey);
            return getenv($matches[1]);
        }, $string);
        return $string;
    }