code: public function removeValue($fieldName, $value)
      {
          $result = $this->row[$fieldName];
          if (!is_array($result)) {
              if ($value == $result) {
                  unset($this->row[$fieldName]);
                  $this->informChanges();
              }
          } else {
              $qty = count($result);
              for ($i = 0; $i < $qty; $i++) {
                  if ($result[$i] == $value) {
                      unset($result[$i]);
                      $this->informChanges();
                  }
              }
              $this->row[$fieldName] = array_values($result);
          }
      }
docs: Remove specified field name with specified value name from row.
  
  @param string $fieldName
  @param $value