delete_row_google_spreadsheet_api.php

<?php
$requestBody = new Google_Service_Sheets_BatchUpdateSpreadsheetRequest(array(
    'requests' => array(
      'deleteDimension' => array(
          'range' => array(
              'sheetId' => 0,
              'dimension' => "ROWS",
              'startIndex' => $rowtodelete, // row number to delete
              'endIndex' => $rowtodelete + 1
          )
      )    
    )
));

$response = $service->spreadsheets->batchUpdate($spreadsheetId, $requestBody);
?>