Wasmer PHP

Website • Docs • Slack Channel

---

A complete and mature WebAssembly runtime for PHP based on Wasmer.

Features

• Easy to use: The wasmer API mimics the standard WebAssembly C API,
• Fast: wasmer executes the WebAssembly modules as fast as possible, close to native speed,
• Safe: All calls to WebAssembly will be fast, but more importantly, completely safe and sandboxed.

Install

To install the library, follow the classical:

git clone https://github.com/wasmerio/wasmer-php
cd wasmer-php/ext
phpize
./configure --enable-wasmer
make
make test
make install

Note: Wasmer doesn't work on Windows yet.

Examples

Procedural API

<?php 

declare(strict_types=1);

$engine = wasm_engine_new();
$store = wasm_store_new($engine);
$wasm = file_get_contents(__DIR__ . DIRECTORY_SEPARATOR . 'hello.wasm');
$module = wasm_module_new($store, $wasm);

function hello_callback() {
    echo 'Calling back...' . PHP_EOL;
    echo '> Hello World!' . PHP_EOL;

    return null;
}

$functype = wasm_functype_new(new Wasm\Vec\ValType(), new Wasm\Vec\ValType());
$func = wasm_func_new($store, $functype, 'hello_callback');
wasm_functype_delete($functype);

$extern = wasm_func_as_extern($func);
$externs = new Wasm\Vec\Extern([$extern]);
$instance = wasm_instance_new($store, $module, $externs);

wasm_func_delete($func);

$exports = wasm_instance_exports($instance);
$run = wasm_extern_as_func($exports[0]);

wasm_module_delete($module);
wasm_instance_delete($instance);

$results = wasm_func_call($run, new Wasm\Vec\Val());

wasm_store_delete($store);
wasm_engine_delete($engine);

Object-oriented API

<?php

declare(strict_types=1);

use Wasm;

require_once __DIR__.'/../vendor/autoload.php';

$engine = Wasm\Engine::new();
$store = Wasm\Store::new($engine);

$wasm = file_get_contents(__DIR__.DIRECTORY_SEPARATOR.'hello.wasm');

$module = Wasm\Module::new($store, $wasm);

function hello_callback()
{
    echo 'Calling back...'.PHP_EOL;
    echo '> Hello World!'.PHP_EOL;

    return null;
}

$functype = Wasm\Functype::new(new Wasm\Vec\ValType(), new Wasm\Vec\ValType());
$func = Wasm\Module\Func::new($store, $functype, 'hello_callback');

$extern = $func->asExtern();
$externs = new Wasm\Vec\Extern([$extern->inner()]);
$instance = Wasm\Module\Instance::new($store, $module, $externs);

$exports = $instance->exports();
$run = $exports[0]->asFunc();

$args = new Wasm\Vec\Val();
$results = $run($args);

This example covers the most basic Wasm use case: we take a Wasm module (in its text representation form), create an instance from it, get an exported function and run it.

You can go through more advanced examples in the dedicated directories:

• Procedural API
• Object-oriented API

Supported platforms and features

Platforms

Platform	Architecture	Status
Linux	amd64	✅
Linux	aarch64	❌
Windows	amd64	❌
Darwin	amd64	✅
Darwin	aarch64	❌

PHP	Status
8.0	✅
7.4	❌
7.3	❌

Features

Compilers and engines

Compiler	Status
Cranelift	✅
LLVM	❌
Singlepass	❌

Engine	Status
Native	✅
JIT	✅
Object File	❌

Runtime

Object	Status
config	✅
engine	✅
store	✅

Types

Type	Status
valtype	✅
functype	✅
globaltype	✅
tabletype	✅
memorytype	✅
externtype	✅
importtype	✅
exporttype	✅

Objects

Object	Status
val	✅
frame	✅
trap	✅
foreign	✅
module	✅
func	✅
global	✅
table	🧑‍💻
memory	✅
extern	✅
instance	✅

Misc

Feature	Status
WAT	✅
WASI	❌
Cross Compilation	❌

License

The entire project is under the MIT License. Please read the LICENSE file.