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New plugin hooks in WordPress 5.4

Important! Some WordPress hooks get applied in multiple PHP files. If you are trying to figure out what a specific WordPress hook does, sort the table by "hook" and make sure you are looking in all the files where it occurs.

Hook Type New? Instances
1 add_trashed_suffix_to_trashed_posts filter YES 1
2 admin_email_remind_interval filter YES 1
3 do_favicon action YES 1
4 do_faviconico action YES 1
5 rest_{$this->post_type}_item_schema note filter YES 1
6 user_erasure_complete_email_headers filter YES 1
7 user_request_action_email_headers filter YES 1
8 user_request_confirmed_email_headers filter YES 1
9 wp_nav_menu_item_custom_fields action YES 1
10 wp_nav_menu_item_custom_fields_customize_template action YES 1
11 wp_privacy_additional_user_profile_data filter YES 1
12 wp_privacy_personal_data_email_headers filter YES 1

Important warning about variable hooks

Some hooks have variables in their names. For example, pre_${taxonomy}_$field and admin_head- both have variable names. In general, any hook that ends (or begins) with - or _, or contains a $, has a variable name. Since the syntax with which these variables are defined may change from version to version, this page may think that a hook is deprecated (or new) even if it is not. You can usually catch this sort of thing by comparing this hook to the list of "related hooks" below.