Php versions – Error on integrating php and google sheets api

I am trying to integrate google sheets api with php so that I can capture html form data and append it to spreadsheet but I am facing a weird error.

Below is the php snippet:

$client = new Google_Client();
$client->setApplicationName('WEBMONK_QUOTATION_REQUESTS');
$client->setScopes([Google_Service_Sheets::SPREADSHEETS]);
$client->setAccessType('offline');
$client->setAuthConfig('../credentials.json');
$service = new Google_Service_Sheets($client);
$spreadsheets_id = '1S2LPDl5XmOEx4TQ3cR4yZ4SAALcxXRyxU5nFMU7RW0I';
$range = 'QUOTESHEET';

$sheet_rows = [
    strval($datetime),
    strval($name),
    strval($email),
    strval($url),
    strval($extras)
];

$body = new Google_Service_Sheets_ValueRange(['values' => [$sheet_rows]]);
$params = ['valueInputOption' => 'RAW'];
$insert = ['insertDataOption' => 'INSERT_ROWS'];
$result = $service->spreadsheets_values->append(
    $spreadsheets_id,
    $range,
    $body,
    $params,
    $insert
);

Here is the error I am getting:

<br />
<b>Fatal error</b>:  Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in C:xampphtdocswebric.orgapivendorgoogleapiclientsrcGoogleServiceResource.php:291
Stack trace:
#0 C:xampphtdocswebric.orgapivendorgoogleapiclientsrcGoogleServiceResource.php(291): implode(Array, '&amp;')
#1 C:xampphtdocswebric.orgapivendorgoogleapiclientsrcGoogleServiceResource.php(190): Google_Service_Resource-&gt;createRequestUri('v4/spreadsheets...', Array)
#2 C:xampphtdocswebric.orgapivendorgoogleapiclient-servicessrcGoogleServiceSheetsResourceSpreadsheetsValues.php(64): Google_Service_Resource-&gt;call('append', Array, 'Google_Service_...')
#3 C:xampphtdocswebric.orgapipostinsert.php(68): Google_Service_Sheets_Resource_SpreadsheetsValues-&gt;append('1S2LPDl5XmOEx4T...', 'QUOTESHEET', Object(Google_Service_Sheets_ValueRange), Array, Array)
#4 {main}
  thrown in <b>C:xampphtdocswebric.orgapivendorgoogleapiclientsrcGoogleServiceResource.php</b> on line <b>291</b><br />

So far, that I have understood, an implode() function in the Google lib is malfunctioning because of wrong argument type. But I couldn’t find anything wrong with my above php code. I have gone through the google sheets and php integration procedures as mentioned here:
PHP with Google Sheets Quickstart

PHP version: 8.0.0,
Google API Client: 2.0

Please tell me where I am going wrong. Thanks in advance.