ImportModel::loadTableInsert PHP Method

    public function loadTableInsert($Tablename, $Path, $skipHeader = true, $chunk = 100)
    {
        $result = false;
        // Get the column count of the table.
        $St = Gdn::structure();
        $St->get(self::TABLE_PREFIX . $Tablename);
        $ColumnCount = count($St->columns());
        $St->reset();
        ini_set('auto_detect_line_endings', true);
        $fp = fopen($Path, 'rb');
        // Figure out the current position.
        $fPosition = val('CurrentLoadPosition', $this->Data, 0);
        if ($fPosition == 0 && $skipHeader) {
            // Skip the header row.
            $Row = self::FGetCSV2($fp);
        }
        if ($fPosition == 0) {
            $Px = Gdn::database()->DatabasePrefix . self::TABLE_PREFIX;
            Gdn::database()->query("truncate table {$Px}{$Tablename}");
        } else {
            fseek($fp, $fPosition);
        }
        $PDO = Gdn::database()->connection();
        $PxTablename = Gdn::database()->DatabasePrefix . self::TABLE_PREFIX . $Tablename;
        $Inserts = '';
        $Count = 0;
        while ($Row = self::FGetCSV2($fp)) {
            ++$Count;
            $result = true;
            $Row = array_map('trim', $Row);
            // Quote the values in the row.
            $Row = array_map(array($PDO, 'quote'), $Row);
            // Add any extra columns to the row.
            while (count($Row) < $ColumnCount) {
                $Row[] = 'null';
            }
            // Add the insert values to the sql.
            if (strlen($Inserts) > 0) {
                $Inserts .= ',';
            }
            $Inserts .= '(' . implode(',', $Row) . ')';
            if ($Count >= $chunk) {
                // Insert in chunks.
                $Sql = "insert {$PxTablename} values {$Inserts}";
                $this->Database->query($Sql);
                $Count = 0;
                $Inserts = '';
                // Check for a timeout.
                if ($this->Timer->elapsedTime() > $this->MaxStepTime) {
                    // The step's taken too long. Save the file position.
                    $Pos = ftell($fp);
                    $this->Data['CurrentLoadPosition'] = $Pos;
                    $Filesize = filesize($Path);
                    if ($Filesize > 0) {
                        $PercentComplete = $Pos / filesize($Path);
                        $this->Data['CurrentStepMessage'] = $Tablename . ' (' . round($PercentComplete * 100.0) . '%)';
                    }
                    fclose($fp);
                    return 0;
                }
            }
        }
        fclose($fp);
        if (strlen($Inserts) > 0) {
            $Sql = "insert {$PxTablename} values {$Inserts}";
            $this->query($Sql);
        }
        return $result;
    }