code: public function setHyperlink($pCellCoordinate, Hyperlink $pHyperlink = null)
      {
          if ($pHyperlink === null) {
              unset($this->hyperlinkCollection[$pCellCoordinate]);
          } else {
              $this->hyperlinkCollection[$pCellCoordinate] = $pHyperlink;
          }
  
          return $this;
      }
docs: Set hyperlink.
  
  @param string $pCellCoordinate Cell coordinate to insert hyperlink, eg: 'A1'
  @param null|Hyperlink $pHyperlink
  
  @return Worksheet