1) Row one is ALWAYS the your column header/label row

2) Column header/labels are both lower case AND spaces, underscores are trimmed. So for example a column header with the cell value of “Member Activity Last 24 hours” would need to be referenced with “memberactivitylast24hours”.

3) Getting your worksheet id is a bit tricky. Here is how I did it. Use the code above to get your $spreadsheetService defined. Then use this code to list the ID for each worksheet:

$query = new Zend_Gdata_Spreadsheets_DocumentQuery();
$query->setSpreadsheetKey($spreadsheetKey);
$feed = $spreadsheetService->getWorksheetFeed($query);
foreach ($feed as $key => $entry) {
echo $entry->title;
echo $entry->id;
}

The result will be something similar to :

[your-worksheet-title]
http://spreadsheets.google.com/feeds/worksheets/xxx_XXXXXXX-XXXXXXXXXXX/private/full/od4

Its the last part of the URI that you want, so in this example ‘od4′ is the id of the given worksheet. Use that where ever you need to provide the worksheet id.