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CC: Asen Alexandrov <alexandrov@vmware.com>
Thread-Topic: PHP build for the wasm32-wasi target
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Date: Thu, 22 Dec 2022 16:04:08 +0000
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Subject: PHP build for the wasm32-wasi target
From: rfernandezl@vmware.com (=?iso-8859-1?Q?Rafael_Fern=E1ndez_L=F3pez?=)

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Content-Transfer-Encoding: quoted-printable

Hello community,

I am reaching out on behalf of the WasmLabs team at the Office of the CTO a=
t VMware.

We have been working on building PHP for WebAssembly, specifically for the =
wasm32-wasi target. WASI [1] is a system interface that allows WebAssembly =
to run on the server side by safely being able to access operating system-l=
ike features, including files and filesystems, Berkeley sockets, clocks and=
 random numbers [2].

WebAssembly in the server side is experiencing a big growth both in interes=
t and users. There are other programming language interpreters that can be =
compiled to wasm32-wasi as of today; for example: Python [3] and Ruby [4].

We have patches for PHP 7.3.33 and 7.4.32 at the time of writing. Porting P=
HP 8.2.0 is work in progress at this time.

In the interest of getting feedback from the PHP community I am providing l=
inks to the patches at GitHub. Please, let us know what would be the next s=
tep to contribute and continue to maintain this work upstream. We look forw=
ard to work with the PHP community.

If you want to try it out, you can download the binaries we are producing i=
n the CI/CD pipeline for 7.3.33 [5] and 7.4.32 [6]. You can use a WASI-enab=
led WebAssembly runtime such as Wasmtime [7] to run PHP compiled to wasm32-=
wasi.

Patches: 7.3.33 [8], 7.4.32 [9][10].

Example execution:

```
$ wasmtime -- --dir ~/php-example php-cgi-7.4.32.wasm ~/php-example/hello/i=
ndex.php
X-Powered-By: PHP/7.4.32
Content-type: text/html; charset=3DUTF-8

Hello, world!
```

We have already presented some of this work at OSS conferences and events l=
ike Kubecon and Docker Community days, and have written a few articles prov=
iding the background to the port, its limitations and what can currently be=
 accomplished (including running WordPress!). Please find below some links =
to the talks and articles:

- Porting PHP to WebAssembly using WASI  [11]
- Running WordPress with WebAssembly using mod_wasm and Apache  [12]
- WebAssembly: Docker without containers! [13]
- mod_wasm: Bringing WebAssembly to Apache [14]: this talk builds on top of=
 PHP 7.3.33 and shows WordPress running with sqlite on top of Apache, thank=
s to an Apache module (mod_wasm) that is able to execute WebAssembly module=
s.
- Docker and WebAssembly, better together [15]: this presentation features =
PHP 7.4.32 and explains a bit of the context of this work.


Thank you,
Rafael Fern=E1ndez L=F3pez.

[1] https://wasi.dev/
[2] https://github.com/bytecodealliance/wasmtime/blob/03463458e426d4bd0601e=
bd82e95b668fc982443/docs/WASI-intro.md
[3] https://docs.python.org/3/whatsnew/3.11.html
[4] https://www.ruby-lang.org/en/news/2022/12/06/ruby-3-2-0-rc1-released/
[5] https://github.com/vmware-labs/webassembly-language-runtimes/releases/t=
ag/php%2F7.3.33%2B20221124-2159d1c
[6] https://github.com/vmware-labs/webassembly-language-runtimes/releases/t=
ag/php%2F7.4.32%2B20221124-2159d1c
[7] https://wasmtime.dev/
[8] https://github.com/vmware-labs/webassembly-language-runtimes/tree/main/=
php/php-7.3.33/patches
[9] https://github.com/vmware-labs/webassembly-language-runtimes/blob/main/=
php/php-7.4.32/patches/0001-Initial-port-of-7.3.33-patch-to-7.4.32.patch
[10] https://github.com/vmware-labs/webassembly-language-runtimes/blob/main=
/php/php-7.4.32/patches/0002-Fix-mmap-issues.-Add-readme.patch
[11] https://wasmlabs.dev/articles/php-wasm32-wasi-port/
[12] https://wasmlabs.dev/articles/running-wordpress-with-mod-wasm/
[13] https://wasmlabs.dev/articles/docker-without-containers/
[14] https://www.youtube.com/watch?v=3DjXe8kulUscQ
[15] https://youtu.be/yo30oF1Gflo?t=3D7361

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