environmentVariables as $variable => $value) { putenv(false === $value ? $variable : "{$variable}={$value}"); } } protected function setEnvironmentVariable(string $variable, mixed $value): void { if (! isset($this->environmentVariables[$variable])) { $this->environmentVariables[$variable] = getenv($variable); } putenv(null === $value ? $variable : "{$variable}={$value}"); } }