The `$post_ID` variable is [546f59c678/WordPress/Sniffs/NamingConventions/ValidVariableNameSniff.php (L54) technically allowed in WPCS], as there is a global of the same name that needs to remain for backward compatibility. However, this name is mostly a remnant of legacy code, and switching to `$post_id` where appropriate brings more consistency with the rest of core.
Additionally, this commit resolves a few WPCS warnings in core:
{{{
Variable "$post_IDs" is not in valid snake_case format
}}}
This affects:
* Function parameters in:
* `add_meta()`
* `post_preview()`
* `WP_Embed::delete_oembed_caches()`
* `WP_Embed::cache_oembed()`
* `wp_get_post_cats()`
* `wp_set_post_cats()`
* `wp_unique_post_slug()`
* `wp_set_post_categories()`
* `wp_check_post_hierarchy_for_loops()`
* `wp_add_trashed_suffix_to_post_name_for_trashed_posts()`
* `wp_filter_wp_template_unique_post_slug()`
* `wp_xmlrpc_server::add_enclosure_if_new()`
* `wp_xmlrpc_server::attach_uploads()`
* `wp_xmlrpc_server::mt_getTrackbackPings()`
* Internal variables in:
* `wp_ajax_inline_save()`
* `wp_ajax_set_post_thumbnail()`
* `wp_ajax_get_post_thumbnail_html()`
* `edit_post()`
* `bulk_edit_posts()`
* `wp_write_post()`
* `WP_Embed::shortcode()`
* `wp_insert_post()`
* `wp_xmlrpc_server::_insert_post()`
* `wp_xmlrpc_server::blogger_getPost()`
* `wp_xmlrpc_server::blogger_newPost()`
* `wp_xmlrpc_server::blogger_editPost()`
* `wp_xmlrpc_server::blogger_deletePost()`
* `wp_xmlrpc_server::mw_getPost()`
* `wp_xmlrpc_server::mw_newPost()`
* `wp_xmlrpc_server::mw_editPost()`
* `wp_xmlrpc_server::mt_getPostCategories()`
* `wp_xmlrpc_server::mt_setPostCategories()`
* `wp_xmlrpc_server::mt_publishPost()`
* `wp_xmlrpc_server::pingback_ping()`
* Hook parameters in:
* `oembed_ttl`
* `embed_oembed_html`
* `wp_insert_post_parent`
* `add_trashed_suffix_to_trashed_posts`
* `pre_post_update`
* `edit_attachment`
* `attachment_updated`
* `add_attachment`
* `edit_post_{$post->post_type}`
* `edit_post`
* `post_updated`
* `save_post_{$post->post_type}`
* `save_post`
* `wp_insert_post`
* `pre_wp_unique_post_slug`
* `wp_unique_post_slug`
* `xmlrpc_call_success_blogger_newPost`
* `xmlrpc_call_success_blogger_editPost`
* `xmlrpc_call_success_blogger_deletePost`
* `xmlrpc_call_success_mw_newPost`
* `xmlrpc_call_success_mw_editPost`
Note: The name change only affects variable names and DocBlocks.
The change does not affect the `$post_ID` global still used in a few places.
Follow-up to [51399], [52958], [53723], [53729], [55190], [55308], [55334].
Props mahekkalola, tanjimtc71, SergeyBiryukov.
Fixes#57692.
Built from https://develop.svn.wordpress.org/trunk@55365
git-svn-id: http://core.svn.wordpress.org/trunk@54898 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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