original_string: public function checksum()
      {
          if (null === $this->checksum) {
              $this->checksum = md5(json_encode($this->files) . $this->version);
          }
  
          return $this->checksum;
      }
code: public function checksum()
      {
          if (null === $this->checksum) {
              $this->checksum = md5(json_encode($this->files) . $this->version);
          }
  
          return $this->checksum;
      }
code_tokens: public function checksum ( ) { if ( null === $ this -> checksum ) { $ this -> checksum = md5 ( json_encode ( $ this -> files ) . $ this -> version ) ; } return $ this -> checksum ; }
docstring: Returns checksum from the configuration files.
  
  You can set $this->checksum = false to disable this check.
  
  @return bool|string
docstring_tokens: Returns checksum from the configuration files .