ACF 5.8 – Introducing ACF Blocks for Gutenberg

There has been a lot of excitement surrounding Gutenberg, the new block-based WordPress editing experience. One of its most compelling features is the ability for developers to create their own custom block types. This opens up an endless array of possibilities for customization.

There’s just one little problem. Creating custom blocks is extremely complicated. How complicated? Well, even a simple testimonials block requires a massive amount of code.

.. We believe that ACF Blocks is one of the more important features ever added to our plugin. It levels the playing field and allows more developers to take advantage of Gutenberg’s key feature.

LAMP vs. MEAN: Which stack is right for you?



LAMP is kind of the dinosaur of web development, used by hundreds of thousands of companies and therefore maintained and supported very well. With endless modules, libraries and add-ons available you can adapt it to your company’s needs.

Being Linux based, you will find help for any topic in the large open source community. MySQL is a very reliable and scalable solution. PHP is in version 7 and is also supported by a mature and big community. PHP is also very fast and integrates well with the rest of the stack.

You can control the server and decide which versions and software you install, so you don’t have to depend on the client’s browser. Best for if you have lots of server-side tasks.


Because it’s easy to learn, there are a lot of developers out there who are not following best practices and building garbage apps. Starting with PHP is easy, but mastering it is hard. This is also true for security in these PHP apps. Some would also describe it as a script language instead of a real programming language because it’s not strongly typed and not pre-compiled. I’d recommend diving in deeper into pros and cons of PHP, Python or Perl.

As for MySQL, other options are becoming more mature. NoSQL databases like MongoDB are popular among enterprises today due to it’s scalability. Plus, pure JavaScript Stacks like MEAN gain more traction every year and new developers might not be interested in learning all of the LAMP’s skills.


Compared to LAMP, the MEAN stack is fairly new. One of its biggest differences is that MEAN is not dependent on a specific operating system – Node.js takes care of server-side execution. The MEAN Stack is especially recommended for JavaScript enthusiasts – as it uses JavaScript at all levels. This also makes it preferred by new developers.

MongoDB is a popular and flexible document based, NoSQL database, compared to MySQL’s relational database system. Angular helps build progressive and modern web apps.

Its components are:

MongoDB (Data persistence)

Express.js (server-side application framework)

Angular.js (client-side application framework)

Node.js (server-side environment)

This stack has some derivatives too:

MERN (React instead of Angular)
MEEN (Ember.js instead of Angular)


Using JavaScript as the primary programming language is a huge advantage. Everything can be set up quickly and done in JS, which makes it much easier to find developers, and LAMP developers typically know JavaScript as well. MongoDB is very popular for its easy schemaless data persistence and is faster than MySQL if you have a lot of read requests. The fact that Angular is maintained by Google is also a big plus. It receives new releases and functions on a constant basis. Another huge advantage is the ability to easily build mobile or desktop apps, for example with Ionic. Code and components can easily be reused or added.


Like all new technologies, MEAN’s glamour is creating some hype. Developers fall for this hype and build their apps in JavaScript, just because it’s trendy. Many of these libraries and frameworks are quite new, and new versions get released quickly, so maintaining your app can become quite a hassle. Since many technologies disappear after a few years, sustainability can become an issue. It’s also harder to maintain a clean code base and follow best practices as your app grows. Further, you have to rely on the client and the client’s available technologies e.g. if you are targeting IE users, embedded systems or low end PCs, there may be usability issues.

A few other stacks to consider:


Windows Server / IIS / Microsoft SQL Server /

Not open source, but all components are from Microsoft, so it should work seamlessly.

LAMP (With MongoDB)

Linux, Apache, MongoDB, PHP

NoSQL Databases like MongoDB can also be used in a classic LAMP environment.

Ruby Stack

Ruby/Ruby on Rails/RVM (Ruby Virtual Machine) / SQLite

This stack is losing popularity. Ruby on Rails was an often used framework once, and thus the whole stack.


Preferred by large enterprises and shied by indie developers for its complexity, Spring offers an entire full-stack framework written in Java.

Django Stack

Python / Django / Apache / MySQL

The Django framework is loved by Python developers, delivers performance and is often referred to as an easy to learn stack.

Pyodide: Bringing the scientific Python stack to the browser

.. Unfortunately, the “language we all have” in the browser, JavaScript, doesn’t have a mature suite of data science libraries, and it’s missing a number of features that are useful for numerical computing, such as operator overloading. We still think it’s worthwhile to work on changing that and moving the JavaScript data science ecosystem forward. In the meantime, we’re also taking a shortcut: we’re meeting data scientists where they are by bringing the popular and mature Python scientific stack to the browser.

It’s also been argued more generally that Python not running in the browser represents an existential threat to the language—with so much user interaction happening on the web or on mobile devices, it needs to work there or be left behind. Therefore, while Pyodide tries to meet the needs of Iodide first, it is engineered to be useful on its own as well.

.. After a discussion with some of Mozilla’s WebAssembly wizards, we saw that the key to building this was emscripten and WebAssembly: technologies to port existing code written in C to the browser.  That led to the discovery of an existing but dormant build of Python for emscripten, cpython-emscripten, which was ultimately used as the basis for Pyodide.

.. WebAssembly is a new language that runs in modern web-browsers, as a complement to JavaScript.  It’s a low-level assembly-like language that runs with near-native performance intended as a compilation target for low-level languages like C and C++.  Notably, the most popular interpreter for Python, called CPython, is implemented in C, so this is the kind of thing emscripten was created for.

Pyodide is put together by:

  • Downloading the source code of the mainstream Python interpreter(CPython), and the scientific computing packages (NumPy, etc.)
  • Applying a very small set of changes to make them work in the new environment
  • Compiling them to WebAssembly using emscripten’s compiler

If you were to just take this WebAssembly and load it in the browser, things would look very different to the Python interpreter than they do when running directly on top of your operating system. For example, web browsers don’t have a file system (a place to load and save files). Fortunately, emscripten provides a virtual file system, written in JavaScript, that the Python interpreter can use. By default, these virtual “files” reside in volatile memory in the browser tab, and they disappear when you navigate away from the page.  (emscripten also provides a way for the file system to store things in the browser’s persistent local storage, but Pyodide doesn’t use it.)

By emulating the file system and other features of a standard computing environment, emscripten makes moving existing projects to the web browser possible with surprisingly few changes. (Some day, we may move to using WASIas the system emulation layer, but for now emscripten is the more mature and complete option).

.. We run CPython’s unit tests as part of Pyodide’s continuous testing to get a handle on what features of Python do and don’t work.  Some things, like threading, don’t work now, but with the newly-available WebAssembly threads, we should be able to add support in the near future.

.. How fast is it?

Running the Python interpreter inside a JavaScript virtual machine adds a performance penalty, but that penalty turns out to be surprisingly small — in our benchmarks, around 1x-12x slower than native on Firefox and 1x-16x slower on Chrome. Experience shows that this is very usable for interactive exploration.

Notably, code that runs a lot of inner loops in Python tends to be slower by a larger factor than code that relies on NumPy to perform its inner loops. Below are the results of running various Pure Python and Numpy benchmarks in Firefox and Chrome compared to natively on the same hardware.

Interaction between Python and JavaScript

If all Pyodide could do is run Python code and write to standard out, it would amount to a cool trick, but it wouldn’t be a practical tool for real work.  The real power comes from its ability to interact with browser APIs and other JavaScript libraries at a very fine level. WebAssembly has been designed to easily interact with the JavaScript running in the browser.  Since we’ve compiled the Python interpreter to WebAssembly, it too has deep integration with the JavaScript side.

Pyodide implicitly converts many of the built-in data types between Python and JavaScript.  Some of these conversions are straightforward and obvious, but as always, it’s the corner cases that are interesting.