Add filter to get_page_by_path

[uzumymw]

Everything looks like that use WP_Query in get_page_by_path will be reverted 56689.

Therefore, I have an idea to add a filter that allows ability to control results.

Example:
apply_filters('get_page_by_path', $found_page, $page_path, $output_type, $post_type)

Trac ticket: https://core.trac.wordpress.org/ticket/57622

Adds a couple of hooks to filter values inside the function get_page_by_path.

• page_by_path_cache_key filters the value for the cache key.
• page_by_path_id filters the found ID.

Trac ticket: core.trac.wordpress.org/ticket/57622

[xipasduarte]

Hello @uzumymw. I've taken a stab at this and provided a different version with a couple of hooks. I found your ticket based on a need I encountered where I wanted to keep the same post_name for two posts, but differentiate then by another property (language, for example). Due to the usage of this function we were not able to make it work without a bunch of hooks and corrections to the returning ID.

The hooks that I propose are:

• page_by_path_id filters the found ID to something that the user believes is the desired result.
• page_by_path_cache_key adds the ability to control the cache key, which allows for scenarios where the same perceived path is actually a reference for two, or more, posts, based on something else.

I didn't add the $last_changed value, because its current effect will bust all caches when the 'posts' cache group is updated. I feel we might want to keep this in the resulting value, even after filtering, so as to prevent caching issues, but I'd differ to others better equipped to answer this.