Update codex doc for function register_taxonomy

[ercartman]

I registered a new taxonomy.

And added post_categories_meta_box to my post type.

But if I saved the post with a taxonomy, an error occurred.

Created new taxonomy with name = id of selected taxonomy.

I checked the errors and found that on my server the $_POST data is transmitted with the type string

But custom taxonomy does not sanitize values by default.

I found param meta_box_sanitize_cb in WordPress source and added to attr when I call a function register_taxonomy:

<?php
'meta_box_sanitize_cb' => 'taxonomy_meta_box_sanitize_cb_checkboxes'

After that, the save works without errors.

Please, add this param to documentation.

[mukesh27]

Duplicate of #36514.

[netweb]

Just to note, the docs added in #36514/r42211 will be shipped in WordPress 5.0, when 5.0 is released the documentation will be updated with this info.

[desrosj]

Since this was closed out as a duplicate, I'm removing needs-dev-note. However, the ticket this one was closed in favor of did receive a developer note, which can be found here: ​https://make.wordpress.org/core/2019/01/23/improved-taxonomy-metabox-sanitization-in-5-1/.