original_string: public function addHeader($header, $value): void
      {
          if ($this->hasHeader($header)) {
              $this->headers[$header][] = $value;
          } else {
              $this->setHeader($header, $value);
          }
      }
code: public function addHeader($header, $value): void
      {
          if ($this->hasHeader($header)) {
              $this->headers[$header][] = $value;
          } else {
              $this->setHeader($header, $value);
          }
      }
code_tokens: public function addHeader ( $ header , $ value ) : void { if ( $ this -> hasHeader ( $ header ) ) { $ this -> headers [ $ header ] [ ] = $ value ; } else { $ this -> setHeader ( $ header , $ value ) ; } }
docstring: Appends a header value for the specified header
  
  Existing values for the specified header will be maintained. The new
  value will be appended to the existing list.
  
  @param  string $header header name to add
  @param  string $value  value of the header
  
  @return void
docstring_tokens: Appends a header value for the specified header