While using reserved PHP keywords as parameter name labels is allowed, in the context of function calls using named parameters in PHP 8.0+, this will easily lead to confusion. To avoid that, it is recommended not to use reserved keywords as function parameter names.
This commit:
* Renames the `$function` parameter to `$callback` in:
* `add_menu_page()`
* `add_submenu_page()`
* `add_management_page()`
* `add_options_page()`
* `add_theme_page()`
* `add_plugins_page()`
* `add_users_page()`
* `add_dashboard_page()`
* `add_posts_page()`
* `add_media_page()`
* `add_links_page()`
* `add_pages_page()`
* `add_comments_page()`
* Renames the `$echo` parameter to `$display` in `menu_page_url()`.
* Renames the `$parent` parameter to `$parent_page` in `get_admin_page_parent()`.
Follow-up to [52946], [52996], [52997], [52998], [53003], [53014], [53029], [53039], [53116], [53117], [53137], [53174], [53184], [53185], [53192], [53193], [53198], [53203], [53207].
Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #55327.
Built from https://develop.svn.wordpress.org/trunk@53215
git-svn-id: http://core.svn.wordpress.org/trunk@52804 1a063a9b-81f0-0310-95a4-ce76da25c4cd
90cbd98c6b