I tried to connect MQTTS with my HTTPS server but it didn't work. It works fine on MQTTX but with PHP it doesn't connect

I tried to connect MQTTS with my HTTPS server but it didn't work. It works fine on MQTTX but with PHP it doesn't connect.

<?php 

$server   = 'myServer';
$port     = '8883';
$clientId = 'testing';
$username = 'XXXX';
$password = 'XXXX';
$clean_session = false;

$connectionSettings  = new ConnectionSettings();
$connectionSettings->setUsername($username)
    ->setPassword($password)
    ->setKeepAliveInterval(60)
    ->setLastWillTopic('mytopic')
    ->setLastWillMessage('client disconnect')
    ->setLastWillQualityOfService(1);

$mqtt = new MqttClient($server, $port, $clientId);
$mqtt->connect($connectionSettings, $clean_session);

$mqtt->subscribe('mytopic/respond', function ($topic, $message) use ($mqtt) {
    echo $message;
}, 2);

$mqtt->close();
$mqtt->interrupt();
?>

How to connect MQTTS with PHP.

For connecting MQTTS we need to add three additional params into the connectionSettings

->setUseTls(true)
->setTlsSelfSignedAllowed(true) // Allow self-signed certificates. Discouraged for production use.
->setTlsVerifyPeer(false)           // Do not require the self-signed certificate to match the host. Discouraged.

https://github.com/php-mqtt/client-examples/blob/master/03_connection_settings/02_use_tls_without_client_certificate.php

<?php 

$server   = 'myServer';
$port     = '8883';
$clientId = 'testing';
$username = 'XXXX';
$password = 'XXXX';
$clean_session = false;

$connectionSettings = (new ConnectionSettings)
    ->setUsername($username)
    ->setPassword($password)
    ->setKeepAliveInterval(60)
    ->setLastWillTopic('mytopic')
    ->setLastWillMessage('client disconnect')
    ->setUseTls(true)
    ->setTlsSelfSignedAllowed(true) // Allow self-signed certificates. Discouraged for production use.
    ->setTlsVerifyPeer(false)           // Do not require the self-signed certificate to match the host. Discouraged.
    ->setLastWillQualityOfService(1);

$mqtt = new MqttClient($server, $port, $clientId);
$mqtt->connect($connectionSettings, $clean_session);

$mqtt->subscribe('mytopic/respond', function ($topic, $message) use ($mqtt) {
    echo $message;
}, 2);

$mqtt->close();
$mqtt->interrupt();
?>