The php.onl blog

Guides and deep-dives on running PHP in the browser: multi-version testing, deprecation checks, privacy, and how php.onl compares to other online PHP tools.

• Best ways to run PHP online in 20262026-06-11

  A fair comparison of the best online PHP tools in 2026 — 3v4l.org, onlinephp.io, PHPSandbox, Replit, and php.onl. Which to pick for cross-version testing, sandboxes, or privacy.

• Run any PHP version in your browser — no server, fully offline2026-06-11

  How php.onl runs real PHP 7.2 through 8.5 entirely in your browser via WebAssembly — no server, no signup, fully private, and working offline once loaded.

• Test PHP deprecations safely: multi-version comparison in one click2026-06-11

  Catch PHP deprecations and behaviour changes before you upgrade. Run the same snippet on PHP 7.2–8.5 in parallel and diff the output — privately, in your browser.