PHP Layer For AWS Lambda

Ever wanted to run PHP websites in AWS Lambda? It's your lucky day! This Lambda Runtime Layer runs the PHP 7.3/7.1 webserver in response to AWS API Gateway or AWS Application Load Balancer requests.

And, if you're looking for a great way to build serverless apps of all kinds, be sure to check out Stackery!

This is an early iteration of the PHP runtime Layer which is not yet ready for production. Please feel free to use this Layer to learn about the Lambda Layers feature and begin experimenting with PHP functions. We welcome feedback and stay tuned for the production-ready version coming soon.

Current Layer Version ARN

When creating/updating a Lambda function you must specify a specific version of the layer. This readme will be kept up to date with the latest version available. The latest available Lambda Layer Version ARNs for PHP 7.3 and 7.1 are:

arn:aws:lambda:<region>:887080169480:layer:php73:1 arn:aws:lambda:<region>:887080169480:layer:php71:8

See Releases for release notes.

Usage

General Usage

The layer runs the PHP 7.* PHP webserver in /var/task, the root directory of function code packages:

$ php -S localhost:8000 '<handler>'

The Lambda Function Handler property specifies the location of the the script executed in response to an incoming API Gateway or Application Load Balancer request.

Configuration Files

There are three locations where PHP configuration may be located:

Files in layer code packages located under /etc/php-${PHP_VERSION}.d/
Files in function code package located under /php-${PHP_VERSION}.d/
php.ini located at the root of the function code package

Replace ${PHP_VERSION} with '7.3', or '7.1' according to your preferred runtime.

Extensions

The following extensions are built into the layer and available in /opt/lib/php/${PHP_VERSION}/modules:

bz2.so
calendar.so
ctype.so
curl.so
dom.so
exif.so
fileinfo.so
ftp.so
gettext.so
iconv.so
json.so
phar.so
posix.so
shmop.so
simplexml.so
sockets.so
sysvmsg.so
sysvsem.so
sysvshm.so
tokenizer.so
wddx.so
xml.so
xmlreader.so
xmlwriter.so
xsl.so
zip.so

These extensions are not loaded by default. You must add the extension to a php.ini file to use it:

extension=json.so

Extensions can be built using the lambci/lambda:build-nodejs8.10 Docker image. It is recommended that custom extensions be provided by a separate Lambda Layer with the extension .so files placed in /lib/php/${PHP_VERSION}/modules/ so they can be loaded alongside the built-in extensions listed above.

SAM Example

Let's create an AWS SAM PHP application. We suggest using Stackery to make this super simple. It automates all the scaffolding shown below. But you may also choose to roll your own application from scratch.

First, install AWS SAM CLI. Make sure to create a SAM deployment bucket as shown in Packaging your application

Next, create a basic SAM application:

$ mkdir my-php-app
$ cd my-php-app

Create a template.yaml file with the following SAM infrastructure:

AWSTemplateFormatVersion: 2010-09-09
Description: My PHP Application
Transform: AWS::Serverless-2016-10-31
Resources:
  phpserver:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Sub ${AWS::StackName}-phpserver
      Description: PHP Webserver
      CodeUri: src/php
      Runtime: provided
      Handler: index.php
      MemorySize: 3008
      Timeout: 30
      Tracing: Active
      Layers:
        - !Sub arn:aws:lambda:${AWS::Region}:887080169480:layer:php73:1
      Events:
        api:
          Type: Api
          Properties:
            Path: /{proxy+}
            Method: ANY

Lastly, let's write our script. Put this in index.php:

Hello World! You've reached <?php print($_SERVER['REQUEST_URI']); ?>

You should now have a directory structure like:

.
├── template.yaml
└── src
    └── php
        └── index.php

We're ready to deploy! Run the following commands:

$ sam package \
    --template-file template.yaml \
    --output-template-file serverless-output.yaml \
    --s3-bucket <your SAM deployment bucket created above>

$ sam deploy \
    --template-file serverless-output.yaml \
    --stack-name my-first-serverless-php-service \
    --capabilities CAPABILITY_IAM

Development

Build the layers by:

Installing a Docker environment
Running make

This will launch Docker containers that will build php73.zip and php71.zip.

If you are behind a proxy server, just set the environment variable http_proxy before invoking make, eg.:

	$ export http_proxy=http://myproxy.acme.com:8080
	$ make php73.zip

Debugging Layer Builds

Run:

	$ docker run --rm -it -v `pwd`:/opt/layer lambci/lambda:build-nodejs8.10 /bin/bash

If you are on Windows, run this instead:

	> docker run --rm -it -v %cd%:/opt/layer lambci/lambda:build-nodejs8.10 /bin/bash

then manually execute the commands in the build.sh file.

Disclaimer

THIS SOFTWARE IS PROVIDED BY THE PHP DEVELOPMENT TEAM ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PHP DEVELOPMENT TEAM OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

License

everyonce/php-lambda-layer

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