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Creating and invoking PHP actions

The process of creating PHP actions is similar to that of other actions. The following sections guide you through creating and invoking a single PHP action, and demonstrate how to bundle multiple PHP files and third party dependencies.

PHP actions are executed using PHP 7.3. The specific version of PHP is listed in the CHANGELOG files in the PHP runtime repository.

To use a PHP runtime, specify the wsk CLI parameter --kind when creating or updating an action. The available PHP kinds are:

  • PHP 7.3: --kind php:7.3

An action is simply a top-level PHP function. For example, create a file called hello.php with the following source code:

<?php
function main(array $args) : array
{
    $name = $args["name"] ?? "stranger";
    $greeting = "Hello $name!";
    echo $greeting;
    return ["greeting" => $greeting];
}

PHP actions always consume an associative array and return an associative array. The entry method for the action is main by default but may be specified explicitly when creating the action with the wsk CLI using --main, as with any other action type.

You can create an OpenWhisk action called helloPHP from this function as follows:

wsk action create helloPHP hello.php

The CLI automatically infers the type of the action from the source file extension. For .php source files, the action runs using a PHP 7.3 runtime.

Action invocation is the same for PHP actions as it is for any other action.

wsk action invoke --result helloPHP --param name World
{
  "greeting": "Hello World!"
}

Find out more about parameters in the Working with parameters section.

Packaging PHP actions in zip files

You can package a PHP action along with other files and dependent packages in a zip file. The filename of the source file containing the entry point (e.g., main) must be index.php. For example, to create an action that includes a second file called helper.php, first create an archive containing your source files:

zip -r helloPHP.zip index.php helper.php

and then create the action:

wsk action create helloPHP --kind php:7.3 helloPHP.zip

Including Composer dependencies

If your PHP action requires Composer dependencies, you can install them as usual using composer require which will create a vendor directory. Add this directory to your action's zip file and create the action:

zip -r helloPHP.zip index.php vendor
wsk action create helloPHP --kind php:7.3 helloPHP.zip

The PHP runtime will automatically include Composer's autoloader for you, so you can immediately use the dependencies in your action code. Note that if you don't include your own vendor folder, then the runtime will include one for you with the following Composer packages:

  • guzzlehttp/guzzle
  • ramsey/uuid

The specific versions of these packages depends on the PHP runtime in use and is listed in the CHANGELOG files in the PHP runtime repository.

Built-in PHP extensions

The following PHP extensions are available in addition to the standard ones:

  • bcmath
  • curl
  • gd
  • intl
  • mbstring
  • mysqli
  • pdo_mysql
  • pdo_pgsql
  • pdo_sqlite
  • soap
  • zip
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