Coding Standards fixes for WP 7.0

[desrosj]

Previously:

• #63168 (6.9)
• #62279 (6.8)
• #61607 (6.7)
• #60700 (6.6)
• #59650 (6.5)
• #58831 (6.4)
• #57839 (6.3)
• #56791 (6.2)
• #55647 (6.1)
• #54728 (6.0)
• #53359 (5.9)
• #52627 (5.8)
• #51799 (5.7)
• #50767 (5.6)
• #49542 (5.5)
• #49222 (5.4)
• #47632 (5.3)
• #45934 (5.1)

Per naming conventions, don’t abbreviate variable names unnecessarily; let the code be unambiguous and self-documenting.

​See PHP Coding Standards - Naming Conventions.

This PR includes renaming of the following variables:

• $post_ID to $post_id. - "Use lowercase letters in variable, action/filter, and function names"
• $ext_type to $extension_type.
• $ext to $extension.
• $id3data to $id3_data. - "Separate words via underscores."
• $msg to $message.
• $sb to $sidebar.
• $alt to $alternate.
• $pid to $post_id.
• $menu_obj to $menu_object.
• $noparents to $no_parents. - "Separate words via underscores."
• $sup to $supplemental.
• $cat_id to $category_id.
• $cat_name to $category_name.
• $out to $output.
• $r to $edit_result.
• $t to $taxonomy.
• $u to $update_result.
• $r to $result.
• $response to $response_data.
• $x to $response.

Trac ticket:
https://core.trac.wordpress.org/ticket/64226
https://core.trac.wordpress.org/ticket/63168
https://core.trac.wordpress.org/ticket/55647

Trac ticket:
https://core.trac.wordpress.org/ticket/64226
https://core.trac.wordpress.org/ticket/63168

[SergeyBiryukov]

In 61224:

Coding Standards: Use more meaningful variable names in Admin Ajax actions.

Per the ​Naming Conventions:

Don’t abbreviate variable names unnecessarily; let the code be unambiguous and self-documenting.

This commit includes renaming of the following variables:

• $post_ID to $post_id — “Use lowercase letters in variable, action/filter, and function names”.
• $ext_type to $extension_type.
• $ext to $extension.
• $id3data to $id3_data — “Separate words via underscores”.
• $msg to $message.
• $sb to $sidebar.
• $alt to $alternate.
• $pid to $post_id.
• $mid to $meta_id.
• $menu_obj to $menu_object.
• $noparents to $no_parents — “Separate words via underscores”.
• $sup to $supplemental.
• $cat_id to $category_id.
• $cat_name to $category_name.
• $out to $output.
• $r to $edit_result.
• $t to $taxonomy.
• $u to $update_result.
• $r to $result.
• $response to $response_data.
• $x to $response.

Follow-up to [53723], [55365].

Props costdev, mukesh27, SergeyBiryukov.
See #64226.

Thanks for the PR! Merged in r61224.

[westonruter]

In 61272:

Twenty Twenty-Five: Remove redundant comments for conditionally-defined functions.

This also improves consistency with other themes.

Follow-up to [59146].

Fixes #64265.
See #64226.
Props hbhalodia, huzaifaalmesbah.

[westonruter]

In 61298:

Docs: Update typing for wp_create_category().

• Ensure that wp_create_category() returns int as opposed to numeric-string.
• Rename $cat_name to $category_name to avoid abbreviating variables.
• Update docblock to remove erroneous int for $category_name param when only string is intended.
• Add missing tests for wp_create_category().

Developed in ​https://github.com/WordPress/wordpress-develop/pull/8861

Props justlevine, westonruter.
See #64238, #64226.