Docs · Getting started
Installation
Install the package and its one PHP extension, then confirm the core dependency.
bash
composer
composer require php-opcua/opcua-client-ext-transport-pubsubRequirements
| Requirement | Notes |
|---|---|
| PHP >= 8.2 | |
ext-sockets |
Used by UdpTransport for UDP unicast/multicast |
ext-openssl |
Transitive — required by the core for Sign / SignAndEncrypt |
php-opcua/opcua-client ^4.4 |
The core client; pulled in automatically |
ext-sockets
The UDP transport is built on ext-sockets (not stream sockets), so it can
join IPv4 multicast groups via MCAST_JOIN_GROUP (with a legacy
IP_ADD_MEMBERSHIP fallback) and set SO_REUSEADDR, the receive buffer,
and TTL. Make sure ext-sockets is enabled — php -m | grep sockets.
Verify
bash
sanity check
php -r "require 'vendor/autoload.php';
echo class_exists(PhpOpcua\Client\ExtTransportPubSub\SubscriberBuilder::class) ? 'ok' : 'missing';"Next: build a working subscriber in Quick start.
Last updated · 2026-06-09