Internal/KillSwitch.php
public function save()
    {
        $dir = dirname($this->path);
        if (!is_dir($dir)) {
            mkdir($dir, 0777, true);
        }
        if (file_put_contents($this->path, json_encode($this->data)) === false) {
            throw new Exception\RuntimeException("Can't save the kill switch file");
        }

        return $this;
    }
public function save()
    {
        $dir = dirname($this->path);
        if (!is_dir($dir)) {
            mkdir($dir, 0777, true);
        }
        if (file_put_contents($this->path, json_encode($this->data)) === false) {
            throw new Exception\RuntimeException("Can't save the kill switch file");
        }

        return $this;
    }
@throws Exception\RuntimeException

@return $this