Add additional APIs to the Really Simple Discovery (RSD) endpoint.
trackback_post
Fires after a trackback is added to a post.
pre_trackback_post
Fires before the trackback is added to a post.
after_signup_form
Fires after the sign-up forms, before wp_footer.
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preprocess_signup_form
Fires when the site sign-up form is sent.
wpmu_active_signup
Filters the type of site sign-up.
before_signup_form
Fires before the site sign-up form.
before_signup_header
Fires before the Site Signup page is loaded.
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signup_get_available_languages
Filters the list of available languages for front-end site signups.
signup_blog_init
Filters the default site creation variables for the site sign-up form.
signup_user_init
Filters the default user variables used on the user sign-up form.
signup_finished
This action is documented in wp-signup.php
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add_signup_meta
This filter is documented in wp-signup.php
signup_create_blog_meta
Filters the new site meta variables.
signup_hidden_fields
This action is documented in wp-signup.php