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Zend Framework Blog:
Implement an XML-RPC server with zend-xmlrpc
Jan 18, 2017 @ 14:22:33

As a sort of follow up to their previous article showing the use of the zend-json-server component to create an XML-RPC service, the Zend blog is back with a different take on the same functionality, this time using zend-xmlrpc.

zend-xmlrpc provides a full-featured XML-RPC client and server implementation. XML-RPC is a Remote Procedure Call protocol using HTTP as the transport and XML for encoding the requests and responses.

[...] Each XML-RPC request consists of a method call, which names the procedure (methodName) to call, along with its parameters. The server then returns a response, the value returned by the procedure.

The post walks you through an example request/response flow and some of the value types allowed in the XML-RPC structure. From there it's on to the code, creating the simple server and an "add" method on the "calculator" service. The post then covers how to integrate this setup with the zend-mvc component and an application based on it. It finishes up with an example of the same kind of functionality only applied in a PSR-7 middleware instead.

tagged: zendframework zendxmlrpc xmlrpc component zendmvc psr7 middleware

Link: https://framework.zend.com/blog/2017-01-17-zend-xmlrpc-server.html

PHP Town Hall Podcast:
Episode 50: Low down on PSR-15
Jan 11, 2017 @ 13:14:07

The PHP Town Hall podcast has returned with a new episode that gives you the low down on PSR-15, a proposal being discussed by the PHP-FIG group to provide structure around middleware implementation.

An all star cast this episode, as Ben and Phil are joined by regular guest Anthony Ferrara - thinker of good ideas and long-time part-time side-line contributor to the PHP-FIG, Woody Gilk - one-speed rider & BDFL of Kohana, and Beau Simensen - author of a bunch of stuff including StackPHP.

Here we’re talking about some awesome stuff the PHP-FIG is working on: PSR-15 (HTTP Middleware). [...] We discuss all this, and the reason PSR-7 (HTTP Message) is not enough for the ecosystem to benefit from shareable middleware.

You can catch this latest episode in a few different ways including the use of the in-page audio or video player, by downloading the mp3 directly or you can view the recording of the live Google Hangout over on YouTube. If you enjoy the episode be sure to subscribe to their feed and follow them on Twitter for updates when new shows are released.

tagged: phptownhall ep50 psr15 phpfig middleware anthonyferrara woodygilk beausimensen

Link: https://phptownhall.com/episode-50-low-down-on-psr15/

Zend Framework Blog:
Implement JSON-RPC with zend-json-server
Jan 11, 2017 @ 12:47:01

On the Zend Framework blog there's a new post showing you how to implement a JSON-RPC interface with zend-json-server, a package from the Zend Framework 2 set of components.

zend-json-server provides a JSON-RPC implementation. JSON-RPC is similar to XML-RPC or SOAP in that it implements a Remote Procedure Call server at a single URI using a predictable calling semantic. Like each of these other protocols, it provides the ability to introspect the server in order to determine what calls are available, what arguments each call expects, and the expected return value(s); JSON-RPC implements this via a Service Mapping Description (SMD), which is usually available via an HTTP GET request to the server.

The article provides a basic example of the creation of a service that handles GET requests and gives back a service mapping description. Building on this, they show how to integrate it into an application that makes use of the zend-mvc structure. They implement a "JsonRpcController" using the same methods as before. Finally they show an example of performing JSON-RPC handling in middleware, outputting the same output as before based on the data in the $response variable.

tagged: zendframework jsonrpc zendjsonserver example controller middleware tutorial

Link: https://framework.zend.com/blog/2017-01-10-zend-json-server.html

SitePoint PHP Blog:
Interrupting Applications with Laravel Middleware
Nov 16, 2016 @ 12:13:05

The SitePoint PHP blog has a new tutorial posted showing you how to "interrupt applications with Laravel middleware", adding functionality to your request/response handling in a more automatic and reusable way.

Before we launch into using middleware with Laravel, what is middleware? In general, middleware is software that connects different systems to one another. In Laravel, it’s one of the most well known and robust PHP frameworks that are available for use today, middleware provides a way for you to filter out your HTTP requests and manage those requests. This allows you to dictate how those requests interact with your application.

The use of middleware in Laravel 5 can interrupt requests to your application. [...] Laravel’s middleware can interrupt those requests and then perform various actions such as controlling access and requiring authentication to enter certain areas.

They get into some of the details about middleware, how it "interrupts" your requests and then relate it back to its use in Laravel applications. The tutorial talks about using the "artisan" command line tool to make the middleware and an embedded video from their own Laravel series giving even more detail.

tagged: laravel middleware interrupt framework tutorial screencast

Link: https://www.sitepoint.com/middleware-in-laravel-5/

Laravel News:
Controller Construct Session Changes in Laravel 5.3
Aug 30, 2016 @ 10:45:13

On the Laravel News site there's a post detailing some of the updates made to session and controller handling in v5.3 of the framework. It mostly revolves around how the middleware handling changed on each request from v5.2.

Back in laravel 5.2, a developer was able to interact with the session directly in a controller constructor. However, this has changed in laravel 5.3.

The difference between how the 5.3 & 5.2 handle an incoming request is that in 5.2 the request goes through 3 pipelines: global, route and controller [...] In 5.3 the request goes through only 2 Pipelines: global and route/controller (in one pipeline).

The post includes a quote from Taylor Otwell (creator and lead developer of the framework) about why this change was made. Then it shows an alternative to directly accessing this session information in your controllers: a Closure-based middleware in the constructor to execute your checks.

tagged: laravel controller session update access middleware change v53

Link: https://laravel-news.com/2016/08/controller-construct-session-changes-in-laravel-5-3/

Laravel News:
Easily Integrate HTTP/2 Server Push with a Laravel Middleware
Aug 12, 2016 @ 09:48:10

The Laravel News site has a recent post showing you how to integrate HTTP2 support into your Laravel-based application using some simple middleware.

As we all know technology changes fast and if you don’t stop and look around once in awhile, you could miss it. HTTP/2 is one area of our tech stack that I haven’t been keeping up with an honestly knew nothing about it until Laracon where Ben Ramsey gave a talk on the subject.

You can watch his talk here and his slide deck is available from his site to browse through. What amazed me is how easy it seemed to implement by utilizing server push or preload.

They describe this "Link" header process could work if done manually but points out that doing that manually for every asset is very time consuming. To help out they point out two packages that can help make it a bit more automatic. The post briefly shows their use (code example) basing the asset list on the contents of your Elixir configuration.

tagged: laravel middleware http2 push link header package

Link: https://laravel-news.com/2016/08/http2-server-push-middleware/

PHP Town Hall:
Episode 50: Low down on PSR-15
Jun 29, 2016 @ 09:20:22

The PHP Town Hall podcast has posted their latest episode (after a bit of hiatus) giving the low down on PSR-15, the proposed PHP-FIG standard for HTTP middleware.

n all star cast this episode, as Ben and Phil are joined by regular guest Anthony Ferrara - thinker of good ideas and long-time part-time side-line contributor to the PHP-FIG, Woody Gilk - one-speed rider & BDFL of Kohana, and Beau Simensen - author of a bunch of stuff including StackPHP.

Here we’re talking about some awesome stuff the PHP-FIG is working on: PSR-15 (HTTP Middleware). [...] We discuss all this, and the reason PSR-7 (HTTP Message) is not enough for the ecosystem to benefit from shareable middleware. [...] Woody provides a bit of the decision-making process in a very tricky aspect of the FIGs job, which is: should standards be built entirely to match existing implementations, or should standards try to improve on the learnings of the existing implementations to better them all as implementations change to support the standard. It’s all a bit chicken and egg, but a very worthy discussion to have.

You can catch this latest episode either through the in-page video player or directly on YouTube. If you enjoy the show, be sure to subscribe to their feed and get the latest as new shoes are released.

tagged: psr15 phpfig middleware proposal standard phptownhall podcast ep50

Link: https://phptownhall.com/episode-50-low-down-on-psr15/

Scotch.io:
Understanding Laravel Middleware
Jun 16, 2016 @ 13:20:48

The Scotch.io site has posted a tutorial that aims to help you understand middleware in Laravel applications - how they work and how to create ones based on your custom needs.

HTTP Middlewares provide a convenient mechanism for filtering HTTP requests entering your application. Laravel, for example, has a middleware for verifying a user's authentication.

These are some cases where I have had to resort to using middleware. There are many more cases where you would like to use a middleware. [...] By the end of this article, you should be able to create a middleware, registers it and use it in your projects. We will be illustrating the creation till usage of middlewares by creating one of our own. Our middleware will enable maintenance either site-wide or on some routes.

They start by creating a middleware (theirs is DownForMaintenance) and how to register it with Laravel as a valid middleware option. By default they will execute with every request but you can narrow them down to only happening on certain routes (examples included). There's also mentions of middleware parameters, grouping middleware and deferring the response return until after other code is executed.

tagged: laravel middleware introduction tutorial create execute configure

Link: https://scotch.io/tutorials/understanding-laravel-middleware

Phil Sturgeon:
Why Care About PHP Middleware?
Jun 02, 2016 @ 10:35:39

Phil Sturgeon has a post over on his site sharing some of his thoughts on PHP middleware and why he thinks it's worth paying attention to in your applications.

Recently there has been a lot of buzz about HTTP middleware in PHP. Since PSR-7 was accepted, everyone and their friend Sherly has been knocking out middleware implementations, some of them stunning, some of them half-arsed, and some of them rolled into existing frameworks. HTTP Middleware is a wonderful thing, but the PHP-FIG is working on a specific standard for middleware, which will standardise this mess of implementations, but some folks don't seem to think that would be useful.

Let's look into middleware a little closer, to show you why it's something to smile about.

He starts with a bit of background about the history of middleware in the PHP ecosystem and where they fit in the overall execution path. He lists out some of the middlewares that have already come out based on this surge in the community including CSRF protection, debugging and rate limiting handling. With various frameworks handling the request/response slightly differently, the PHP-FIG worked up a standard to make interoperability easier. He links to some other resources about middleware that have been posted and discussions he's had with other people about their usefulness.

HTTP Middleware is awesome. It lets frameworks do far less, it lets people distribute logic in a way often unseen popularly in PHP, it lets more of your application be reusable, and it lets PHP catch up with other popular languages used to build stuff on the web. PSR-7 was a great step towards this goal, but we need another PSR to get the whole way there.
tagged: middleware opinion psr7 request response phpfig example

Link: https://philsturgeon.uk/2016/05/31/why-care-about-php-middleware/

Andrew Carter:
PSR-7 Objects Are Not Immutable
May 24, 2016 @ 10:28:05

Andrew Carter has written up a new post about PSR-7 objects (the PHP-FIG defined standard for handling requests and responses in PHP applications) and how the objects themselves are immutable.

What’s happening [in the provided example] is that the Zend Expressive framework is rendering the error page to the same object that you wrote your message to. Whilst the actual message object itself is immutable, the body stream that it references is not. Even when this object is cloned or “modified” (to become a new object) it will still use the same stream.

He explains a bit about what this means in a more practical sense and why the PSR-7 standard and why this happens (as defined after much discussion). Then he gets into a more recent debate happening in the PHP-FIG about PSR-7 middleware and the proposal for a standard structure in its creation. He points to some of the thoughts from Anthony Ferrara on the topic and an example from Woody Gilk showing an exception handler and how having the stream always appending content is a bad thing in that particular case.

tagged: psr7 object immutability output zendexpressive middleware stream

Link: http://andrewcarteruk.github.io/programming/2016/05/22/psr-7-is-not-immutable.html