original_string: public function addSignerfile($file)
      {
          if (!file_exists($file)) {
              throw new Error('file not found', 'File does not exist. Please use an absolute file path.');
          }
  
          $this->signer_file = fopen($file, 'rb');
          return $this;
      }
code: public function addSignerfile($file)
      {
          if (!file_exists($file)) {
              throw new Error('file not found', 'File does not exist. Please use an absolute file path.');
          }
  
          $this->signer_file = fopen($file, 'rb');
          return $this;
      }
code_tokens: public function addSignerfile ( $ file ) { if ( ! file_exists ( $ file ) ) { throw new Error ( 'file not found' , 'File does not exist. Please use an absolute file path.' ) ; } $ this -> signer_file = fopen ( $ file , 'rb' ) ; return $ this ; }
docstring: Adds a list of signers in a CSV file. Required unless signer_list is used.
  
  @param  string $file path for signer_file
  @return BulkSendJob
  @ignore
docstring_tokens: Adds a list of signers in a CSV file . Required unless signer_list is used .