WP-rocket aggressive purge

In some cases WP-rocket cache plugin empties all cached files although all you do is update a post or product. Or for me when a customer does a purchase that changes the stock value for a WooCommerce product. What I can see, this doesn’t happen for me when updating a product from within WP. So it’s not consistent.

I found this is caused in rocket_get_purge_urls in inc/common/purge.php. When checking for previous and next posts to clear it sometimes finds the front page and adds that url to $purge_urls. This doesn’t only clear the cache for the actual front page, but all the cached files in that directory, i.e. the complete site!

I’ve sent this bug to the WP-rocket team, hopefully they can find a way to fix it.

But until then one way to work around this is to add a filter that always ignores the home page url. This filter doesn’t affect the domain_clean, so no worries when updating WP options or theme settings that should empty all cache.

function disable_cache_clearing_files( $urls ){
  // urls to exclude
  $exclude_urls = [ get_site_url(), get_site_url() . "/" ]; //, $_SERVER['SERVER_NAME'] ];

  // get all urls except excluded urls
  $urls = array_diff( $urls, $exclude_urls);
  return $urls;
add_filter( 'rocket_post_purge_urls', 'disable_cache_clearing_files');

The issue is also explained here:







Cleanup session in WooCommerce

There are some pretty simple ways to clear a session with WooCommerce that can be used with code when you need a user to get a brand new session with nothing old getting in the way. Can be used if you by code set a country or currency that’s not the WooCommerce default for example.

The most brutal (and sometimes most officiant way) is to destroy the session completely.



This line cleans the session and clears the cookies for you and should be called early in WordPress since it tampers with cookies and session variables. For example:

// clear WC session if argument do_cleanup is true is passed
add_action( 'wp_loaded', 'my_cleanup_session');
function my_cleanup_session() {
  if ($_REQUEST['do_cleanup'] == 'true') {
    // cleanup old session
    // force redirect (needed in some cases) 
    //wp_safe_redirect( '/' );

There are other alternatives as well if you don’t need to completely destroy the session. You could try one of these instead:

// clears session, but keeps cookies

// clear specific users session

// forgets the session without destroying it

Check for more details in the code reference.

Check if one variation is enabled or disabled in WooCommerce

One of my clients had the need to sometime disable one variation of many, but to avoid deleting and adding again they use en little checkbox Enable in the variation setting. Really simple!

But not equally simple to find out how to check that status in code it turned out. But after digging in the WooCommerce source I found out it uses the actual status of the “product”, i.e. every variation is kind of a product, but with a parent and some other stuff. So this is how you check that Enable checkbox:

$variation = wc_get_product($variation_id);
if ($variation->get_status( 'edit' ) == 'publish') {
  // do something if enabled
if ($variation->get_status( 'edit' ) == 'private') {
  // do something if NOT enabled

So as you can see, the code is REALLY simple, a smart way of the WooCommerce team to reuse already built functionality. But it took a little while to find after googling for attributes, properties, meta-data and other stuff. Not so much on the web on this topic.

Use of attachment_url_to_postid in WordPress

I did some image lookup via ajax from the Elementor Image Gallery, a place where I only had the image-url to get a meta data field attached to the image. To find the image id I instead used the WordPress helper function attachment_url_to_postid, that made the lookup for me.

But I found that sometimes the lookup didn’t work for some reason. After some digging I found that WordPress adds the ending ‘-scaled’ to the image, which makes the lookup function not finding the image since it’s not the original name.

// get the image url via ajax in some way, sanitize url as simple security check
$image_url = sanitize_text_field( $_REQUEST['image_url'] ); 

// get only the image file name, to avoid looking for cdn-url for example
$image_url = end(explode('/', $image_url));

// If the filename is an auto-generated thumbnail, remove the sizes and get the URL of the original image
$image_url_org = preg_replace( '/-\d+x\d+(?=\.(webp|jpg|jpeg|png|gif)$)/i', '', $image_url );

// do the same thing but add '-scaled' to the name if the first lookup fails
$image_url_scaled = preg_replace( '/-\d+x\d+(?=\.(webp|jpg|jpeg|png|gif)$)/i', '-scaled', $image_url );

// do the magic, find the actual image id, to be used to find meta data on for example
$image_id = attachment_url_to_postid($image_url_org);

// if the original name fails, try with the '-scaled' name added to it.
if ($image_id == 0) { // try to find image with scale ending if not found with original name
	$image_id = attachment_url_to_postid($image_url_scaled);

// hopefully now you got the id to return or do whatever you need with it.
return $image_id;

WooCommerce – really slow wc_get_product_class

In my investigation and work to make WooCommerce perform a little bit better i found this little surprise! The little helper wc_get_product_class to print correct class names in the wrapper element in html for me took over 100ms per product. With over 100 products it’s really bad! I have quite complex products with many variations. But REALLY slowing down.

So this little code is now removed from my code.

wc_get_product_class('my-product', $product)

Yes, for me this was a good solution. I just added “product” as class instead. And saved 100ms per product! Good enough for my purpose, but it might not be sufficient for everyone.

If you don’t overwrite the product with a template, here is one way that might help you override this:

add_filter( 'woocommerce_attribute_taxonomies', 'remove_slowdowns_caused_by_taxonomies', 10, 1); function remove_slowdowns_caused_by_taxonomies($attribute_taxonomies){ return array('product'); }

Or read more here for more solutions:


WooCommerce – find default variation performance

My shop page was very slow when I had over 100 products, REALLY slow. So I had to investigate what happened. So here are some points.

Find default variation

One thing I did for every product was to find the default variation to show correct image, and the code I used was this. My products have 15 variations, and this was really bad for performance.

$default_attributes = $product->get_default_attributes();
$available_variations = $product->get_available_variations();

foreach($available_variations as $variation_values ) {
  $found_variations = 0;
  foreach($default_attributes as $key => $default_attribute_value ) {
    if ($variation_values['attributes']['attribute_'.$key] == $default_attribute_value) {
  // return variation_id if found all of the default variations 
  if (count($default_attributes) == $found_variations) {
    return $variation_values['variation_id'];

Instead i found the neat little function find_matching_product_variation, so instead of the nested foreach loops, I use the Data_Store_CPT to do the same.

$default_attributes = $product->get_default_attributes();
$attributes = [];
foreach ($default_attributes as $key => $value) {
  $attributes['attribute_'.$key] = $value;
return (new \WC_Product_Data_Store_CPT())->find_matching_product_variation(
        new \WC_Product($product->get_id()),

The same procedure that on my machine in the first foreach loops took 70-90 ms now take around 2 ms instead!

WooCommerce zero trimming decimal

I found this little neat thing when messing around with decimals in WooCommerce.

// Trim only when decimal is zero in price
add_filter( 'woocommerce_price_trim_zeros', '__return_true' );

Nice of them to provide this little filter! But even better if it was a setting in wp-admin, but until that is added, this is a quite simple solution. Just put the above code in your functions.php.

If you can’t access your functions.php or don’t know howto do it, there is of course a plugin for that. It’s made by Therichpost, and it only does exactly the above small filter snippet above. So really simple and not bloated with other crap 😉

Select2 on existing select-dropdown

I had some issues with using Selct2 on an already existing select where the select attribute was already set. The problem was Select2 didn’t unselect the previously set option. To by-pass that I did this workaround.

To use Select2 check their installation guide here. When that is setup I used this jquery snippet where I;

  1. temporary save the previously set option
  2. removing that attribute from option
  3. init Select2 to the select element
  4. set the saved option again with the Select2 .val() function
jQuery(document).ready( function($) {
  // temporary save the current selected option
  selected = $("#my_select option:selected").val(); 
  // remove selected attribute to make default selected work
  $("#my_select option:selected").removeAttr("selected");
  // init select2
    minimumResultsForSearch: -1,
    multiple: false

  // set default value again


This is an example of previous select snippet where the second option is pre-selected.

<select id="my_select">
  <option value="my-first">First option</option>
  <option value="my-second" selected="selected">Second option</option>

Elementor Custom Modules

Creating lots of modules in you theme for Elementor? Do you want to skip the step of loading the files and classes manually? I use this code which makes things very handy, just create the php-file with the same name as the class and it will be loaded automagic.

class My_Elementor_Widgets_Loader {
  protected static $_instance = null;

  /* change path to the local directory where you put the elementor modules */
  private $path = "/php/elementor_widgets/";
  public static function instance() {
    if ( ! isset( self::$_instance ) ) {
      self::$_instance = new self();
    return self::$_instance;

  protected function __construct() {
    add_action( 'elementor/widgets/widgets_registered', [ $this, 'register_widgets' ], 99 );

  public function register_widgets() {
    /* register all classes (must be named as the php files) */
    foreach(glob(get_stylesheet_directory() . "/php/elementor_widgets/*.php") as $file) {
      $path_parts = pathinfo($file);

      /* change if using other namespace, or remove '__NAMESPACE__ .' if no namespace */
      $class_name = __NAMESPACE__ . '\\Widgets\\' . $path_parts['filename'];
      \Elementor\Plugin::instance()->widgets_manager->register_widget_type( new $class_name() );

  public function include_widgets_files() {
    /* load all php files */
    foreach(glob(get_stylesheet_directory() . $this->path . "*.php") as $file) {


Hope this will help you!