original_string: public function removeHeader($key)
      {
          if (isset($this->headers[$key])) {
              unset($this->headers[$key]);
          }
          return $this;
      }
code: public function removeHeader($key)
      {
          if (isset($this->headers[$key])) {
              unset($this->headers[$key]);
          }
          return $this;
      }
code_tokens: public function removeHeader ( $ key ) { if ( isset ( $ this -> headers [ $ key ] ) ) { unset ( $ this -> headers [ $ key ] ) ; } return $ this ; }
docstring: Remove a header by key.
  
  @param string $key
  
  @return $this
docstring_tokens: Remove a header by key .