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Using the PHP Host SDK

Check your installation

Please be sure you've installed Extism before continuing with this guide.

1. Install the PHP library​

Install via Packagist:

composer require extism/extism
caution

For the time being you may need to add a minimum-stability of "dev" to your composer.json

{
    // ...
    "minimum-stability": "dev",
    // ...
}

2. Import the library and use the APIs​

Count Vowels Plugin

code.wasm in this example is our example plugin that counts vowels. If you want to run this, download it first and set the path:

curl https://raw.githubusercontent.com/extism/extism/main/wasm/code.wasm > code.wasm
index.php
<?php

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

$ctx = new \Extism\Context();
$wasm = file_get_contents("../../wasm/code.wasm");
$plugin = new \Extism\Plugin($ctx, $wasm);

$output = $plugin->call("count_vowels", "this is an example");
$json = json_decode(pack('C*', ...$output));
echo "Vowels counted = " . $json->{'count'} . PHP_EOL;

NOTE: on some MacOS devices (particularly Apple Silicon), you may hit an error regarding the Security.framework. We're working on a solution here, but in the meantime, if this happens to you please file an issue or comment here: https://github.com/extism/extism/issues/96.

Need help?​

If you've encountered a bug or think something is missing, please open an issue on the Extism GitHub repository.

There is an active community on Discord where the project maintainers and users can help you. Come hang out!