Piwik\DataTable::setMetadataValues PHP Method

    public function setMetadataValues($values)
    {
        foreach ($values as $name => $value) {
            $this->metadata[$name] = $value;
        }
    }

 /**
  * Sets the total visits, actions & revenue for a DataTable returned by
  * $this->buildDataTable.
  *
  * @param DataTable $dataTable
  * @param array $apiMetrics Metrics info.
  * @return array Array of three values: total visits, total actions, total revenue
  */
 private function setMetricsTotalsMetadata($dataTable, $apiMetrics)
 {
     if ($dataTable instanceof DataTable\Map) {
         foreach ($dataTable->getDataTables() as $table) {
             $this->setMetricsTotalsMetadata($table, $apiMetrics);
         }
     } else {
         $totals = array();
         foreach ($apiMetrics as $label => $recordName) {
             $totals[$label] = 0;
         }
         foreach ($dataTable->getRows() as $row) {
             foreach ($apiMetrics as $totalMetadataName => $recordName) {
                 $totals[$totalMetadataName] += $row->getColumn($recordName);
             }
         }
         $dataTable->setMetadataValues($totals);
     }
 }