Home » Development » PHP » Seite 7
JSON Formatter & Validator helps debugging JSON data, either data you wrote by hand or data that has been output in one compact line :)
JSON Formatter & Validator
Again another Google AMP article, this time dealing with Syntax Highlighting. If you have a code centric website, this is important.
In one of my last articles I talked about a Generic Syntax Highlighter. This time I want to show you, how to add Syntax Highlighting with GeSHi to a custom template in AMP-WP.
Please read up on documentation, as I am not diving into every detail.
I was about to write my own, when I found an older article from phoboslab. Thanks Dominic for saving me some time ;) Its not perfect, but close enough.
A simple Syntax Highlighting Class that does just that. The class was not working with PHP 5.4.x+, as it uses preg_replace() with the /e modifier.
It will not cover all, but its better than nothing :) I will also add a section to my my AMP tweaks article to showcase the integration of Geshi.
Here an updated version using the preg_replace_callback() function.
„virtPHP is a tool for creating and managing multiple isolated PHP environments on a single machine. It’s like Python’s virtualenv, but for PHP.
virtPHP creates isolated environments so that you may run any number of PHP development projects, all using different versions of PEAR packages and different PECL extensions. You may even specify a different version of PHP, if your system has various installations of PHP.“
virtPHP @ Github
The AMP (Accelerated Mobile Pages Project) plugin for WordPress is still pretty young and under heavy development.
There are little things that can help to fix current validation problems. I have a couple of fresh AMP pages, that are already indexed by Google.
The currently registered Microformats template (schema.org-NewsArticle) requires an image.
The AMP-WP documentation explains how to add a featured image to your pages (documentation).
I extended that a bit, to link a default attachment image, I uploaded before. This needs to be added to your themes functions.php.
Next we adjust the Microformats definition. This needs to be added to your themes functions.php.
Read the AMP-WP documentation first :) This forces AMP-WP to override the core template with your own. Use the default template as a reference.
Normally the core sanitizer should take care of that. I am sure a filter will be added in the future. For now, this is a quick workaround. You can use a RegExp or DOMDocument to alter the amp-content in your custom template and filter things that break validation.
I am using phpQuery for now, as it allows me to add quick fixes. DOMNode or QueryPath works nicely as well :) Will be looking at the core sanitizer and options later this week. All of this is currently added to the custom template.
Finally output the fixed content as HTML.
The above examples need to be tweaked to your specific content requirements.
The custom template „post_amp_content“ before:
The custom template „post_amp_content“ after:
From the AMP specification :“Note, that AMP document may also be linked to directly…“
This is being added to the custom template as well.
You can find a simple pure PHP highlighter here. Not perfect, but a start. Don not forget to include the CSS :)
I will extend on this as new validation errors or tweaks come up. The core sanitizer of AMP-WP still needs some work and should allow us to do some of the above directly, when the content is parsed / converted for AMP.
Make Syntax Highlighting work in AMP-WP using GeSHi
Time to get AMP ready
Google’s AMP is here to save us from slow mobile content delivery, by enforcing strict standards and limiting what is allowed within AMP pages. The pages only allow a subset of tags and introduce their own tags for fast prefetching of content (images, videos … AMP Specs)
„The Accelerated Mobile Pages (“AMP”) Project is an open source initiative that came out of discussions between publishers and technology companies about the need to improve the entire mobile content ecosystem for everyone – publishers, consumer platforms, creators, and users.
Today, the expectation is that content should load super fast and be easy to explore. The reality is that content can take several seconds to load, or, because the user abandons the slow page, never fully loads at all. Accelerated Mobile Pages are web pages designed to load instantaneously – they are a step towards a better mobile web for all.“
AMP pages are cached within the AMP Cache, providing even faster delivery of your content. The core libs validate your implementation and highlight any problems by pushing errors to the console.
The documentation lists all components currently supported within a page and experimental components in development as well.
I have already added AMP support to our blog posts:
Google’s Webmaster Tools also integrates a new section for AMP, to see how they perform.
AMP is not supposed to replace your webpage, but offer a faster access point to presented content. It will not solve all use cases, but offer better performance for your simple reading pleasure for now. Its a start and lets see how it evolves ;)
Simple way to do some Visual Composer Grid cleanup, when you are using Bootstrap within your theme. This removes and cleans up classes.
Visual Composer for WordPress
Bootstrap / Bootstrap Sass
JSON validator – JSONLint / JSONFormatter
Polyfill for older browsers – JSON3
Make sure content within the object complies to UTF-8, if not encode it before !
Even DateTime is nicely encoded :)
Depending from where you want to access the page, post or custom post-type data, it might not always be available that easily.
WordPress provides an option to get your data through the page-slug.
The function is called get_page_by_path.