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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

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

$user_id

(int|array) (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;

	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' ),
			)
		);
	}
}

Uses

Uses Description
wp-includes/formatting.php: wp_unslash()

Remove slashes from a string or array of strings.
wp-includes/pluggable.php: get_userdata()

Retrieve user info by user ID.
wp-includes/functions.php: current_time()

Retrieves the current time based on specified type.
wp-includes/wp-db.php: wpdb::insert()

Inserts a row into the table.

Changelog

Version Description
MU (3.0.0) MU (3.0.0)
5.1.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wpmu_log_new_registrations