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Joost de Valk jdevalk

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Scripts for getting the number of tags and posts on a site

If a WordPress site doesn't have XML sitemaps, or you can't find them, there are a number of ways to figure out how many tags and posts that site has. The easiest way is by using the REST API to get the number. Note both scripts below are fairly similar and could probably be simplified. Also: please don't run this on sites too aggressively. Not all sites handle getting 100 posts from their REST API endpoints very well.

jdevalk /
Last active January 26, 2024 07:20

EDD Multi-currency currency by country switcher

The worker.js Cloudflare worker below determines the currency and sets a cookie. The PHP code reads the cookie and sets the session currency in EDD.

Playground Comment Worker

This simple playground.yml creates a comment that opens a WordPress Playground and installs the plugin from the current repository. The current iteration only works with plugins that do not require a build step.

Playground test comment in action

CORS issues

Because GitHub doesn't send the right CORS headers for zip files to be able to install them in a Playground, you need a reverse proxy to bypass the CORS restrictions. The Worker below in worker.js can be used as a Cloudflare worker that

jdevalk / xmlrpc.php
Created June 12, 2023 11:14
If you're not using XMLRPC, this will save tons of uncached requests to your site, assuming your homepage is cached properly.
$protocol = 'https';
if ( ! isset( $_SERVER['HTTPS'] ) || $_SERVER['HTTPS'] === 'off' ) {
$protocol = 'http';
$url = $protocol . "://" . $_SERVER['HTTP_HOST'];
header( 'Location: ' . $url, true, 301 );
jdevalk / copyrightholder.php
Last active January 6, 2022 04:00
This is how to add the copyrightHolder schema to the Website Schema piece Yoast SEO outputs.
add_filter( 'wpseo_schema_website', 'example_change_website_schema', 10, 2 );
* Changes the Yoast SEO Website schema.
* @param array $data The Schema Website data.
* @param Meta_Tags_Context $context Context value object.
jdevalk / register-graph-piece.php
Created January 22, 2020 12:39
This is the code used to generate the Event Schema for YoastCon
* Adds Schema pieces to our output.
* @param array $pieces Graph pieces to output.
* @param \WPSEO_Schema_Context $context Object with context variables.
* @return array $pieces Graph pieces to output.
jdevalk / two-products-best.json
Last active May 7, 2019 01:39
Two JSON blobs, one with the main product, a second one that can be output later on the page that clearly relates itself to the first one as a related product.
<script type="application/ld+json">{
"@context": "",
"@graph": [
"@type": "Organization",
"@id": "",
"name": "Yoast",
"url": "",
"sameAs": [
jdevalk /
Last active July 13, 2018 12:07
What to do with SVG's

Regex search:

  • style=(["|'])fill:#([a-zA-Z0-9]{3,});\1 replace with fill="#$2"
  • (class|id)=(["|'])([a-zA-Z_0-9-^-]+)\2 replace with blank

In a nuttshell:

  • Remove <title> and <decoration> if the image is “just decoration”.
  • Add role="img" aria-hidden="true" focusable="false" to the svg. Exclude aria-hidden="true" if its an infographic.
  • If its important to understand the “svg” in order to understand what the page is about, use aria-labelledby="title desc" on the SVG and use and element in the SVG.

Why we removed redirects from the advanced tab of Yoast SEO

Yes, we have prevented you from adding new 301 redirects in the advanced tab of the Yoast SEO meta box. And we have a couple of very good reasons for that.

As it was, it was virtually impossible to keep track of what post is redirected where. You’d have to open each post or visit each URL to find out. This was causing quite a mess over time.

Our Yoast SEO Premium customers, who have access to a far better redirects module, often ran into posts that were redirected while no redirect was set in the redirects module. Having to manage redirects in a couple of different locations really is undoable.

Checking for the set 301 redirect also requires us to do an extra query on every pageload. Which means we had to slow your website down a bit, just to check if there was a redirect set. Since speed is gaining importance as a ranking factor, we are constantly looking how we can further optimize our plu

jdevalk / dev-environment.php
Created July 23, 2015 08:33
Throw this in your dev environments mu-plugins folder and add it to your .gitignore file :)
* Disables plugins on your dev environment
* @param $plugins
* @return mixed
function yst_dev_env_disable_plugins( $plugins ) {