Compile PHP in a Amazon Linux 2 machine

sudo yum update -y
mkdir php
curl -sL https://github.com/php/php-src/archive/php-8.0.0.tar.gz | tar -xvz
cd php-src-php-8.0.0/
sudo yum install -y gcc autoconf bison re2c libcurl-devel libxml2-devel openssl-devel sqlite-devel oniguruma-devel libzip-devel bzip2-devel
./buildconf --force
# Run ./configure --help for full list of options
./configure --prefix=/home/ec2-user/php/ --with-openssl --with-curl --with-zlib --with-zip --enable-mbstring --enable-cli
sudo make install

Create a zip file that contains the PHP binary, library files and bootstrap file (an example is attached)

mkdir -p ~/runtime/bin/lib/
cd ~/runtime
cp ~/php/bin/php bin/
cp /usr/lib64/libonig.so.2 bin/lib/
cp /usr/lib64/libzip.so.5 bin/lib/
touch ./bootstrap && chmod +x ./bootstrap
# Edit bootstrap file
zip -r runtime.zip bin/php bootstrap

Upload the zip file as a layer using the web console or CLI.
In the web console, add the layer to your function using the ARN of the layer.
Add an environment variable with key LD_LIBRARY_PATH and value /opt/bin/lib/

bootstrap

#!/opt/bin/php
<?php

while (true) {
    // Get an event. The HTTP request will block until one is received
    $request = getNextRequest();

    // 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 $_ENV['LAMBDA_TASK_ROOT'].'/'.$handlerFunction.'.php';

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

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

function getNextRequest() {
    $url = 'http://'.$_ENV['AWS_LAMBDA_RUNTIME_API'].'/2018-06-01/runtime/invocation/next';
    $tmpHeaderFile = tempnam(sys_get_temp_dir(), 'php');
    $eventData = shell_exec('curl -sS -LD '.escapeshellarg($tmpHeaderFile).' -X GET '.escapeshellarg($url));
    $requestId = shell_exec('grep -Fi Lambda-Runtime-Aws-Request-Id '.escapeshellarg($tmpHeaderFile).' | tr -d \'[:space:]\' | cut -d: -f2');
    unlink($tmpHeaderFile);
    return [
        'requestId' => trim($requestId),
        'eventData' => json_decode($eventData, true),
    ];
}

function sendResponse($requestId, $response) {
    $url = 'http://'.$_ENV['AWS_LAMBDA_RUNTIME_API'].'/2018-06-01/runtime/invocation/'.$requestId.'/response';
    shell_exec('curl -X POST '.escapeshellarg($url).' -d '.escapeshellarg($response));
}

louischan/lambda-php-runtime.md

bootstrap