wp-includes/ms-functions.php:2038Logs the user email, IP, and registration date of a new site.
$blog_idWP_Site|int$user_idint|arrayfunction wpmu_log_new_registrations( $blog_id, $user_id ) { global $wpdb; if ( is_object( $blog_id ) ) { $blog_id = $blog_id->blog_id; } if ( is_array( $user_id ) ) { $user_id = ! empty( $user_id['user_id'] ) ? $user_id['user_id'] : 0; } $user = get_userdata( (int) $user_id ); if ( $user ) { $wpdb->insert( $wpdb->registration_log, array( 'email' => $user->user_email, 'IP' => preg_replace( '/[^0-9., ]/', '', wp_unslash( $_SERVER['REMOTE_ADDR'] ) ), 'blog_id' => $blog_id, 'date_registered' => current_time( 'mysql' ), ) ); }}Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.