Run PHP 8.4 online

PHP 8.4 brought one of the biggest object-model upgrades in years. You can run it right now in your browser — no install, no server, nothing uploaded. Open the playground, select 8.4, and Run. php.onl executes an official WebAssembly build, so the behaviour matches real PHP 8.4.

What's new in PHP 8.4

• Property hooks — define get and set logic directly on a property, replacing boilerplate getter/setter methods: public string $name { get => ucfirst($this->_name); set => $this->_name = $value; }.
• Asymmetric visibility — make a property publicly readable but only privately writable with public private(set) string $id;.
• array_find(), array_any(), array_all() — first-class helpers for searching arrays without writing loops.
• The #[\Deprecated] attribute — mark your own functions and methods as deprecated so callers get a proper engine warning.
• Lazy objects — defer expensive object initialization until a property is actually accessed, useful for ORMs and dependency injection.
• A new HTML5 DOM API — Dom\HTMLDocument parses modern HTML correctly, alongside the existing DOM extension.
• mb_trim(), mb_ltrim(), mb_rtrim() — multibyte-aware trimming.

Try it in seconds

Paste this into the playground with 8.4 selected:

<?php
class Temperature {
    public function __construct(private float $c) {}
    public float $fahrenheit {
        get => $this->c * 9 / 5 + 32;
    }
}
echo (new Temperature(25))->fahrenheit, PHP_EOL; // 77

Compare 8.4 with other releases

Property hooks and asymmetric visibility are 8.4 features — running the snippet above on 8.3 will surface a parse error. That contrast is exactly what php.onl makes easy: select 8.4 next to 8.5 or 8.3, run once, and compare the outputs side by side. Browse every release on the versions page.

Why run PHP 8.4 here

• Private — code runs locally via WebAssembly and is never transmitted.
• Offline — the 8.4 runtime is cached after first load.
• No signup — just open and run.

Run PHP 8.4 now →