public function checksum()
    {
        if (null === $this->checksum) {
            $this->checksum = md5(json_encode($this->files) . $this->version);
        }

        return $this->checksum;
    }
public function checksum()
    {
        if (null === $this->checksum) {
            $this->checksum = md5(json_encode($this->files) . $this->version);
        }

        return $this->checksum;
    }
public function checksum ( ) { if ( null === $ this -> checksum ) { $ this -> checksum = md5 ( json_encode ( $ this -> files ) . $ this -> version ) ; } return $ this -> checksum ; }
Returns checksum from the configuration files.

You can set $this->checksum = false to disable this check.

@return bool|string
Returns checksum from the configuration files .