How to correctly send a request for file_get_contents in a loop?

Question

PHP

Hello!
Dear colleagues, please answer this question.
How would you organize a mailing list in a telegram bot?
If there are 100 subscribers and send messages to each I do
$user = new \TGbot\Users();
foreach($users as $user){
$tgClient->send($user->id,$message);
}
In the send function, the usual file_get_contents()
At the same time, the cycle is not ending, the script is simply chopped off.
How to optimize the script so that the mailing is completely successful and not interrupted
Thanks for the answers.