Not able to connect Firebase with php - wordpress

Question

I am using firebase as backend in php, but when i am calling "fromJsonFile" method of "ServiceAccount" i am getting bellow error:
Fatal error: Uncaught Error: Call to private method
Kreait\Firebase\ServiceAccount::fromJsonFile() from context '' in
C:\xampp\htdocs\wordpress\wp-content\plugins\firebase-connection.php:7
Stack trace: #0 C:\xampp\htdocs\wordpress\wp-content\plugins\sb-api\sb_api.php(31):
include() #1 C:\xampp\htdocs\wordpress\wp-settings.php(362):
include_once('C:\xampp\htdocs...') #2
C:\xampp\htdocs\wordpress\wp-config.php(90):
require_once('C:\xampp\htdocs...') #3
C:\xampp\htdocs\wordpress\wp-load.php(37):
require_once('C:\xampp\htdocs...') #4
C:\xampp\htdocs\wordpress\wp-admin\admin.php(34):
require_once('C:\xampp\htdocs...') #5
C:\xampp\htdocs\wordpress\wp-admin\index.php(10):
require_once('C:\xampp\htdocs...') #6 {main}
thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\firebase-connection.php
on line 7
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Here is my code:
<?php
require __DIR__.'/vendor/autoload.php';
use Kreait\Firebase\Factory;
use Kreait\Firebase\ServiceAccount;
$serviceAccount = ServiceAccount::fromJsonFile(__DIR__.'/google-service-account.json');
$firebase = (new Factory)
->withServiceAccount($serviceAccount)
->create();
$database = $firebase->getDatabase();
?>

Answer 1

Can you tell us the version of the firebase-php that you are currently using?
If you are using version lower than 5.x please update to the latest version.
https://github.com/kreait/firebase-php
It is using php 7.2^. Current wordpress requires 7.3 so it must be updated to latest version
Here is the documentation as well.
https://firebase-php.readthedocs.io/en/latest/
I don't know exactly what the problem is but it seems the error says you can't access a private method, so you should access it by updating it to public or public static method.

Answer 2

For ver 5.x
// #see https://firebase-php.readthedocs.io/en/5.2.0/troubleshooting.html
$factory = (new Factory)->withServiceAccount(__DIR__.'/google-service-account.json');
$database = $factory->createDatabase();
// if you want auth
//$auth = $factory->createAuth();