original_string: public function addWriteData($buf)
      {
          if ($this->outBuf === null) {
              $this->outBuf = $buf;
          } else {
              $this->outBuf .= $buf;
          }
      }
code: public function addWriteData($buf)
      {
          if ($this->outBuf === null) {
              $this->outBuf = $buf;
          } else {
              $this->outBuf .= $buf;
          }
      }
code_tokens: public function addWriteData ( $ buf ) { if ( $ this -> outBuf === null ) { $ this -> outBuf = $ buf ; } else { $ this -> outBuf .= $ buf ; } }
docstring: Append writing cache
  @param $buf string data content.
docstring_tokens: Append writing cache