How to catch asynchronous php?

Question

CodeIgniter

Hello.
In general, I play around with the asynchronous execution of php code. The bottom line is ... There is a script, it refers to third-party web services. There are many services, their response time is different. If you synchronously execute each request to the web service, then it takes a lot of time ...
There is a library https://github.com/bucefal91/php-async from the respected https://habrahabr.ru/users/bucefal91/. Using this library, I make an asynchronous call to web services, something like this

$webservices=['service1', 'service2', 'service3'];  //веб-сервисов может быть произвольное количество
$service=[];
foreach($webservices as $k=>$v){
      $service[$v]=new ToolsAsyncResult('php index.php ' . $v); //делаем запрос к каждому сервису
}

An instance of the ToolsAsyncResult class has an isRunning() method - which returns true during script execution and false if a result is received.
For one asynchronous call, catching the result is not a problem - the author did it like this

//тут мы вызваем ассинхронный запрос
$foo=new ToolsAsyncResult('php index.php servicename' ); 
while($foo->isRunning()){
//крутим цикл пока не придет ответ от сервиса
}
$result=$foo->result(); //получаем результат и как то его обрабатываем

How to catch the moment when all instances of the ToolsAsyncResult class return data?
do this way

while($service[0]->isRunning() AND $service[1]->isRunning() AND $service[3]->isRunning()){
//крутим цикл пока не придет ответ от сервиса
}

I can't, because the number of running calls can be arbitrary.
Please help my grief