[Waiting for user feedback] url_to_postid() in secondary language always returns 0 for valid URL

My apologies for the small bag in the provided snippet. Kindly take note that our supporters are not obligated to provide any custom code solutions. This is something that is usually not supported by our support policy. I provided this snippet voluntarily.

Suggestions:
- pass the wpml_object_id filter to $page_id
- pass the wpml_permalink filter to $permalink
- set the language URL format to "Languages in directories".

Can you please first confirm if you followed my suggestion of using the WPML Hooks for this purpose?

I can only escalate an issue to second-tier support if we are handling a bug in WPML that was confirmed.

Please try to recreate the issue using a simple example on the following test site:
hidden link

Make sure to leave me a comment on this ticket once the issue has been recreated and I will take a look into it.

You need to call the hooks before calling the function.

The url_to_postid() returns the ID of the post.

I have no issue taking a look at the site, but I do honestly not think that this is necessary. I already provided a solution for the issue so that you can obtain the correct ID per language:

// Use the wpml_current_language hook to get the current language
$current_language = apply_filters( 'wpml_current_language', NULL );
 
// Get the permalink for a specific post (replace with your post ID)
$post_permalink = get_permalink( $post_id );
 
// Get the post ID from the URL (this works for the default language, based on permalink)
$post_id_in_default_language = url_to_post_id( $post_permalink );
 
// Use WPML's filter to get the translated post ID in the current language
$translated_post_id = apply_filters( 'wpml_object_id', $post_id_in_default_language, 'post', false, $current_language );
 
// $translated_post_id now contains the post ID for the current language
echo $translated_post_id;

Take kindly note that our supporters are not expected to provide such a custom code solution. I am doing this on a voluntary base.

Let me explain the approach in detail:

You are using a native WordPress function that is not aware of different languages on the website to use the URL of a page or post as an argument and to return the ID of each post or page.

This is why you need to use wpml_currenct_language to get the current language of the website.

// Use the wpml_current_language hook to get the current language
$current_language = apply_filters( 'wpml_current_language', NULL );

Then we pass $current_language to wpml_permalink to the permalink for each post to each language:

// Get the permalink for a specific post (replace with your post ID)
$post_permalink = get_permalink( $post_id );

Then we use this $post_permalink to pass it as URL to url_to_post_id().

// Get the post ID from the URL (this works for the default language, based on permalink)
$post_id_in_default_language = url_to_post_id( $post_permalink );

Finally, we hold the post_id inside $post_id_in_default_language and we pass it to wpml_object_id which will get the correct ID per language, and at the same time we pass $current_language.

// Use WPML's filter to get the translated post ID in the current language
$translated_post_id = apply_filters( 'wpml_object_id', $post_id_in_default_language, 'post', false, $current_language );

This means, $translated_post_id will now return the original post ID in site's default language and any translated post ID in second languages.