domain_exists()
Function: Checks whether a site name is already taken.
Source: wp-includes/ms-functions.php:1548
insert_blog()
Function: Store basic site info in the blogs table.
Source: wp-includes/ms-deprecated.php:572
wpmu_validate_user_signup()
Function: Sanitizes and validates data required for a user sign-up.
Source: wp-includes/ms-functions.php:455
wpmu_activate_user
Action Hook: Fires immediately after a new user is activated.
Source: wp-includes/ms-functions.php:1215
wpmu_validate_user_signup
Filter Hook: Filters the validated user registration details.
Source: wp-includes/ms-functions.php:584
wpmu_activate_blog
Action Hook: Fires immediately after a site is activated.
Source: wp-includes/ms-functions.php:1267
wpmu_validate_blog_signup()
Function: Processes new site registrations.
Source: wp-includes/ms-functions.php:621
wpmu_create_user()
Function: Creates a user.
Source: wp-includes/ms-functions.php:1310
newblogname
Filter Hook: Filters the new site name during registration.
Source: wp-includes/ms-functions.php:690
wpmu_new_user
Action Hook: Fires immediately after a new user is created.
Source: wp-includes/ms-functions.php:1329