Static singletons used everywhere

[stevebauman]

I'm working on an application that will facilitate reporting against multiple Meta integrations during the same request, but I quickly discovered that this is will cause issues if you keep one integration in memory and call it later after another one has been initialized. For example:

use FacebookAds\Api;

$one = Api::init(...);

$two = Api::init(...); // Overwrites the first

$one->... // API calls will now actually occur on $two

I thought there would be a way around this by setting the HTTP client inside of the EventRequest manually:

facebook-php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php

Lines 214 to 217 in f3eb099

	public function setHttpClient($http_client) {
	$this->http_client = $http_client;
	return $this;
	}

But then the singletons are called regardless later on:

facebook-php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php

Lines 309 to 313 in f3eb099

	if (HttpServiceClientConfig::getInstance()->getAccessToken() == null) {
	$params['access_token'] = Api::instance()->getSession()->getAccessToken();
	} else {
	$params['access_token'] = HttpServiceClientConfig::getInstance()->getAccessToken();
	}

facebook-php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php

Lines 316 to 320 in f3eb099

	if (HttpServiceClientConfig::getInstance()->getAppsecret() == null) {
	$appsecret = Api::instance()->getSession()->getAppSecret();
	} else {
	$appsecret = HttpServiceClientConfig::getInstance()->getAppsecret();
	}

Why is this the case? Why do all these static PHP singletons need to exist? This will surely cause issues for anyone running a PHP application from memory (Swoole, FrankenPHP, RoadRunner, etc.).