Create user in ejabbred using PHP - php

Question

Right now I am trying to create a user in ejabberd using PHP. I have checked many sources From Git. As well as I tried to follow the same answer as given in this question
But sometimes user is going to be created, and sometimes not, so any debug points.
https://github.com/fabiang/xmpp
As per my knowledge there is issue related to time limit between create user one after another in ejabberd.
For example :
My script is going to run and create a user at a time.
Then I have to wait around 8-9 minutes, then I am try executing my script then it will create another user for me on first try but IF I try to create another user just after some time.
Is that possible?
CODE :
<?php
require 'vendor/autoload.php';
error_reporting(-1);
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
use Fabiang\Xmpp\Options;
use Fabiang\Xmpp\Client;
use Fabiang\Xmpp\Protocol\Register;
use Fabiang\Xmpp\Protocol\Roster;
use Fabiang\Xmpp\Protocol\Presence;
use Fabiang\Xmpp\Protocol\Message;
$logger = new Logger('xmpp');
$logger->pushHandler(new StreamHandler('php://stdout', Logger::DEBUG));
$hostname ='192.168.1.12';
$port = 5222;
$connectionType = 'tcp';
$address = "$connectionType://$hostname:$port";
$adminUsername ="admin";
$adminPassword = "admin";
$name ="87878";
$name ="87890";
$password = "maddy";
$options = new Options($address);
$options->setUsername($adminUsername)
->setPassword($adminPassword)
->setContextOptions(['ssl' => ['verify_peer' => false,'verify_peer_name' => false]]);
$client = new Client($options);
$client->connect();
$register = new Register($name, $password);
$client->send($register);
$client->disconnect();
?>
Any suggestions?