code: public function unlinkFiles($fileName)
      {
          $folder = $this->getWebrootFolder();
  
          if ($fileName) {
              if (@file_exists($folder . '/' . $fileName)) {
                  unlink($folder . '/' . $fileName);
              }
              if (@file_exists($folder . '/' . $this->thumbFolder . '/' . $fileName)) {
                  unlink($folder . '/' . $this->thumbFolder . '/' . $fileName);
              }
              if (is_array($this->sizes)) {
                  $i = 0;
                  foreach ($this->sizes as $size) {
                      if (@file_exists($folder . '/' . $i . '/' . $fileName)) {
                          unlink($folder . '/' . $i . '/' . $fileName);
                      }
                      $i++;
                  }
              }
          }
      }
docs: Helper function for unlink files
  @param $fileName