Developing software in the Real World

Implementing CORS in Zend Expressive

On a recent project, I needed to implement CORS support for my Expressive API. The easiest way to do this is to use Mike Tuupola's PSR-7 CORS Middleware. As this is a standard Slim-Style PSR-7 middleware implementation, we need to wrap it for Expressive, so we make a factory: App/Factory/CorsMiddlewareFactory.php:

We then register this in our App\ConfigProvider::getDependencies() by adding to the factories key so that it looks something like this:

If you don't… continue reading.

Customising Whoops in Expressive

I find the Whoops error handler page in Expressive quite hard to read and particularly dislike that the error message displayed in the top left is hidden if it's more than a few words long. To fix this, I discovered that you can provide a custom CSS file to the PrettyPrintHandler and then override to your heart's content! One way to do this is to add a delegator factory to add the additional functionality, so… continue reading.

OuputBuffer Middleware for Expressive

When developing an Expressive application, if you use var_dump(), echo, print_r(), etc when you get this error:

This occurs after your data has been displayed and makes perfect sense as Expressive is unable to send headers as you've already started sending the body. To solve this, you need some middleware. It looks like this:

This middleware wraps all subsequent middleware in an output buffer and then either appends or prepends the contents to… continue reading.

Displaying errors in Expressive with Twig

If you're not using the Whoops error handler with Expressive and are using the Twig renderer, then you are given no information about the problem that occurred, even in debug mode. To fix this, I changed error.html.twig to this:

The new part is the within the {% if error %} block. In debug mode, error is set to the exception that was thown and is blank otherwise, so you won't leak sensitive information (as… continue reading.

Pretty print curl -i

My favourite tool for working with APIs is curl, though I recognise that lots of people like HTTPie and seem very keen to tell about it every time I mention curl… With curl, I particularly like using the -i switch to view the status line and headers too without the additional cruft of -v: This generates an output that looks like this:

What I would like to do is pretty print the body if… continue reading.

Converting a Composer dependency to git for editing

I'm adding a new feature to ZF's Problem-Details component and it's easiest to do this within the context of the application I'm developing. The component lives in vendor/zendframework/zend-problem-details and was installed using composer require so doesn't have its own git repository as the distribution zip file was used to install it. To change it to a git repository, we can use the –prefer-source option and specify a branch like this:

I now have a… continue reading.

CORS and OpenWhisk web actions

By default, OpenWhisk will handle the relevant responses for CORS. Specifically, it will respond to an OPTIONS request with these headers:

If you need to change what is sent or you don't want to send these headers at all, then you need to do set the annotation web-custom-options to true and handle the OPTIONS header yourself. Note that if you don't set this annotation, you must not set any of these headers yourself as… continue reading.

Using PostgreSQL with PHP in Cloud Foundry

Having successfully deployed a PHP application to Cloud Foundry, I needed a PostgreSQL database for persistent storage. I found Lorna Mitchell's Connecting PHP to MySQL on Bluemix helpful and this article expands on that information. I want to create a cloud-based PostgreSQL database and connect it to Laravel's Eloquent in a Cloud Foundry application. This is how to do it. Create the database instance As I'm using Bluemix for my Cloud Foundry hosting, I'm using… continue reading.

Deploying a PHP application to Cloud Foundry

I recently had a requirement to deploy a Slim application somewhere. As I already have a Bluemix account, it seemed sensible to deploy it to their Application Runtimes service which is an installation of the Open Source Cloud Foundry project. This turned out to be quite easy, but there are a number of steps involved, so I'm documenting it here. Setup the CLI tools I'm a command line person, so did it all via the… continue reading.

Getting started with Serverless PHP

I've been interested in Apache OpenWhisk for a little while now and recently submitted a new feature to add PHP support to the project. As OpenWhisk is a serverless environment, most users do not run their own copy and instead use a commercial provider with IBMs Bluemix available now along with Adobes I/O Runtime and RedHat coming soon. As a result, my contribution, isn't practically useful until it's in production with a provider. Fortunately, and… continue reading.