I'm developing a Wordpress plugin (integrated with WooCommerce) that fetches HTML Content from an API, and add it to a WP Post as post_content into an iframe, this way:

$newData['description'] = str_replace("\n", "", $newData['description']);
$newData['description'] = str_replace("\t", "", $newData['description']);
$post = $this->getPostByAPIId($product->api_id);

$id = $post->ID ?? get_post($product->woo_id)->ID;
if (isset($id) && !empty($id)) {
            'post_content'  => '<iframe class="custom-post" id="custom_product_post_content" src="' . htmlspecialchars('data:text/html,' . stripslashes(rawurlencode($newData['description']))) . '" style="display: block;width:100vw; height:100vh; border:none; margin:0; padding:0; overflow:hidden; z-index:999999; min-height:300px!important;"></iframe>'
            'ID' => $id

Even if I put the kses_remove_filters(), when I open wordpress to check the new content, I find out that the post_content is empty.

If I try to debug the plugin with xdebug, I find out that post_content is updated, but when I refresh wordpress, the post_content disappear.

A few project specifications before starting:

  1. I can't just embed the API as src
  2. I don't want to fetch content via javascript
  3. I used an iframe because I know that wordpress post_content can't embed a full HTML page like this: html > head { title } > body { style and various tags }
  4. I don't write the HTML personally, I need to embed it via the API

Feel free to ask any question. Thanks in advance.

Edit: Even if I use wp_update_post(['ID' => $id, 'post_content' => '...']) the post_content doesn't get updated and I get empty content.

Edit 2:

I enabled query log on my development environment and during debug session I found out that the function that "remove" the post_content is

wc_update_product_stock( $postId, $quantity )

Even if I wrap this function with a kses_remove_filters(), the function doesn't change its behaviour. Is there any way to "change" this behaviour without changing stock quantity update?

  • Why are you inserting directly into the database and not using wp_update_post()? Nov 26, 2018 at 10:30
  • Because wp_update_post() doesn't update the post_content
    – Kalizi
    Nov 26, 2018 at 10:56
  • What? Of course it does. Nov 26, 2018 at 10:57
  • I tried to perform wp_update_post(['ID' => $id, 'post_content' => '...']) but when I refresh the wordpress page, or I select the post_content from the posts table, I get empty post_content.
    – Kalizi
    Nov 26, 2018 at 10:59
  • Aren't you having the same problem with the version in your question? Nov 26, 2018 at 11:00

1 Answer 1


WooCommerce stock quantity update by using

wc_update_product_stock( $postId, $quantity )

used to remove post_content, so I put quantity update before the post_content update.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.