wpmu_log_new_registrations( WP_Site|int $blog_id, int|array $user_id )

Logs the user email, IP, and registration date of a new site.

Parameters

$blog_id

(Required) The new site's object or ID.

$user_id

(Required) User ID, or array of arguments including 'user_id'.

Source

File: wp-includes/ms-functions.php 

function wpmu_log_new_registrations( $blog_id, $user_id ) {
	global $wpdb;
	$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')) );
}

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Changelog

Changelog
Version Description
5.1.0 Parameters now support input from the 'wp_initialize_site' action.
MU (3.0.0) Introduced. MU (3.0.0)