Add a new row to a spreadsheet using Google Sheets API v4

addRowToSpreadsheet.php

<?php
/**
 * This is a proof of concept. In real life you would split up the various parts and allow for different cell value
 * types. Also read Leviscowles1986's comment below:
 * https://gist.github.com/thehelvetian/2e94d60b796735b167dfb1c7560049ae#gistcomment-1822986
 *
 * @param array $ary_values An array containing the cell values
 * @return bool Request status
 */
function addRowToSpreadsheet($ary_values = array()) {

	// Set up the API
	$client = new Google_Client();
	$client->setAuthConfigFile(KEYS_PATH.'/client_secret.json'); // Use your own client_secret JSON file
	$client->addScope(Google_Service_Sheets::SPREADSHEETS);
	$accessToken = 'ACCESS_TOKEN'; // Use your generated access token
	$client->setAccessToken($accessToken);
	$sheet_service = new Google_Service_Sheets($client);

	// Set the sheet ID
	$fileId = 'SPREADHEET_FILE_ID'; // Copy & paste from a spreadsheet URL

	// Build the CellData array
	$values = array();
	foreach( $ary_values AS $d ) {
		$cellData = new Google_Service_Sheets_CellData();
		$value = new Google_Service_Sheets_ExtendedValue();
		$value->setStringValue($d);
		$cellData->setUserEnteredValue($value);
		$values[] = $cellData;
	}

	// Build the RowData
	$rowData = new Google_Service_Sheets_RowData();
	$rowData->setValues($values);

	// Prepare the request
	$append_request = new Google_Service_Sheets_AppendCellsRequest();
	$append_request->setSheetId(0);
	$append_request->setRows($rowData);
	$append_request->setFields('userEnteredValue');

	// Set the request
	$request = new Google_Service_Sheets_Request();
	$request->setAppendCells($append_request);

	// Add the request to the requests array
	$requests = array();
	$requests[] = $request;

	// Prepare the update
	$batchUpdateRequest = new Google_Service_Sheets_BatchUpdateSpreadsheetRequest(array(
		'requests' => $requests
	));
	
	try {
		// Execute the request
		$response = $sheet_service->spreadsheets->batchUpdate($fileId, $batchUpdateRequest);
		if( $response->valid() ) {
			// Success, the row has been added
			return true;
		}
	} catch (Exception $e) {
		// Something went wrong
		error_log($e->getMessage());
	}
	
	return false;
}

Perfect! Thank you