Piwik\DataTable::addRow PHP Method

    public function addRow(Row $row)
    {
        // if there is a upper limit on the number of allowed rows and the table is full,
        // add the new row to the summary row
        if ($this->maximumAllowedRows > 0 && $this->getRowsCount() >= $this->maximumAllowedRows - 1) {
            if ($this->summaryRow === null) {
                // create the summary row if necessary
                $columns = array('label' => self::LABEL_SUMMARY_ROW) + $row->getColumns();
                $this->addSummaryRow(new Row(array(Row::COLUMNS => $columns)));
            } else {
                $this->summaryRow->sumRow($row, $enableCopyMetadata = false, $this->getMetadata(self::COLUMN_AGGREGATION_OPS_METADATA_NAME));
            }
            return $this->summaryRow;
        }
        $this->rows[] = $row;
        if (!$this->indexNotUpToDate && $this->rebuildIndexContinuously) {
            $label = $row->getColumn('label');
            if ($label !== false) {
                $this->rowsIndexByLabel[$label] = count($this->rows) - 1;
            }
        }
        return $row;
    }

 private function addRowWithMetadata($metadata)
 {
     $row = new Row(array(Row::COLUMNS => array('label' => 'val1')));
     foreach ($metadata as $name => $value) {
         $row->setMetadata($name, $value);
     }
     $this->table->addRow($row);
 }