PHP · version 8.3

Run PHP 8.3 online

PHP 8.3 — run it in a Firecracker microVM on ls-judge. Real toolchain, no wrapper.

Starter code

What you get in PHP 8.3

Clicking "Run now" opens the playground with this exact code and a matching test case — passes on first Run.

php
PHP 8.3
<?php $n = (int)trim(fgets(STDIN)); echo ($n * 2) . "\n";
stdin →21
expected →42
How it runs

How ls-judge runs PHP 8.3

Every submission is compiled and executed inside its own Firecracker microVM — the same isolation primitive AWS Lambda uses. No shared container, no shared kernel with other users' code. The PHP 8.3toolchain shipped with the microVM is the real thing (not a browser-side emulation): syscalls behave the way they do in production, and the compile / runtime behaviour matches what you would see on your own machine with that version installed.

Feed stdin from the Tests panel, watch verdicts stream per test case over a WebSocket. Free to use, no sign-up, works from any browser.

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