aws-lambda-layer-php/bootstrap

#! /opt/bin/php -c /opt/etc/php.ini
<?php

// This invokes Composer's autoloader so that we'll be able to use Guzzle and any other 3rd party libraries we need.
require __DIR__ . '/vendor/autoload.php';


function getNextRequest()
{
    $client = new \GuzzleHttp\Client();
    $response = $client->get('http://' . $_ENV['AWS_LAMBDA_RUNTIME_API'] . '/2018-06-01/runtime/invocation/next');

    return [
        'invocationId' => $response->getHeader('Lambda-Runtime-Aws-Request-Id')[0],
        'payload' => json_decode((string)$response->getBody(), true)
    ];
}


function sendResponse($invocationId, $response)
{
    $client = new \GuzzleHttp\Client();
    $client->post(
        'http://' . $_ENV['AWS_LAMBDA_RUNTIME_API'] . '/2018-06-01/runtime/invocation/' . $invocationId . '/response',
        ['body' => $response]
    );
}


function sendError($invocationId, $error)
{
    $client = new \GuzzleHttp\Client();
    $client->post(
        'http://' . $_ENV['AWS_LAMBDA_RUNTIME_API'] . '/2018-06-01/runtime/invocation/' . $invocationId . '/error',
        ['body' => $error]
    );
}


// This is the request processing loop. Barring unrecoverable failure, this loop runs until the environment shuts down.
do {
    // Ask the runtime API for a request to handle.
    $request = getNextRequest();

    try {
        // Obtain the function name from the _HANDLER environment variable and ensure the function's code is available.
        $handlerFunction = array_slice(explode('.', $_ENV['_HANDLER']), -1)[0];
        require_once $_ENV['LAMBDA_TASK_ROOT'] . '/src/' . $handlerFunction . '.php';

        // Execute the desired function and obtain the response.
        $response = $handlerFunction($request['payload']);

        // Submit the response back to the runtime API.
        sendResponse($request['invocationId'], $response);

    } catch (Throwable $e) {
        sendError($request['invocationId'], (string)$e);
    }
} while (true);