This action is documented in wp-signup.php
confirm_another_blog_signup
Confirm a new site signup.
signup_create_blog_meta
Filters the new site meta variables.
add_signup_meta
This filter is documented in wp-signup.php
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validate_another_blog_signup
Validate a new site signup for an existing user.
signup_another_blog_init
Filters the default site sign-up variables.
signup_hidden_fields
This action is documented in wp-signup.php
signup_another_blog
Allow returning users to sign up for another site
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signup_extra_fields
Fires at the end of the user registration form on the site sign-up form.
validate_user_form
Validate user signup name and email
validate_blog_form
Validate the new site signup
show_user_form
Display user registration form
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signup_blogform
Fires after the site sign-up form.
show_blog_form
Generates and displays the Signup and Create Site forms
wpmu_signup_stylesheet
Prints styles for front-end Multisite signup pages