Runtime requirements

Required and optional capabilities

The reviewed Server manifest requires PHP CLI >=8.1 and ext-json. This is the package constraint, not a promise that every PHP version/backend combination has been tested.

Capability	Requirement
Multi-process supervision on Unix	pcntl; posix for Unix process/user operations
Single-process fallback	Used without pcntl; does not provide the same supervision/control features
TLS	An appropriate OpenSSL-enabled PHP build and certificate configuration
Native loop backends	event, ev, Swoole or Swow are optional; inspect the chosen backend
Fiber loop	Optional revolt/event-loop and a compatible context; plain sleep is not automatically asynchronous
External session storage	Install the Redis/MongoDB driver required by the selected handler

Linux is the primary deployment target for the multi-process model. macOS is a separate Unix platform, not Linux. On Windows, verify the single-process path and avoid assuming Unix signals or daemon control work.

php -v
php --ini
php -m
composer check-platform-reqs
composer show localzet/server

Run these with the same PHP CLI executable and configuration as the service. A working FPM configuration does not prove CLI extensions exist. Test the complete recipes before adding your own handlers. Do not pipe an unreviewed remote environment-check script directly into PHP.

Reviewed source manifest. Reviewed 2026-10-17; Ivan Zorin / Localzet Group.