register_new_user │ action-hook │ WP 4.4.0

Fires after a new user is registered, allowing an action to be performed.

The event fires at the very end of register_new_user(), after all operations.

Usage

add_action( 'register_new_user', 'wp_kama_register_new_user_action' );

/**
 * Function for `register_new_user` action-hook.
 * 
 * @param int $user_id ID of the newly registered user.
 *
 * @return void
 */
function wp_kama_register_new_user_action( $user_id ){
	// action...
}

$user_id(integer)

The registered user's ID.

Examples

#1 Disable the email to the administrator about a new user registration

After a new user registers, WordPress sends a registration email to the administrator and the user. This behavior is not always needed, so change it.

For a regular WordPress installation:

// Disable emails for everyone
remove_action( 'register_new_user', 'wp_send_new_user_notifications' );
remove_action( 'edit_user_created_user', 'wp_send_new_user_notifications' );

// Add them back (if needed), but only for the user
add_action( 'register_new_user', 'my_wp_send_new_user_notifications' );
add_action( 'edit_user_created_user', 'my_wp_send_new_user_notifications' );

function my_wp_send_new_user_notifications( $user_id ) {
	wp_new_user_notification( $user_id, null, 'user' );
}

For WordPress Multisite:

// Disable emails for everyone
remove_action( 'network_site_new_created_user', 'wp_send_new_user_notifications' );
remove_action( 'network_site_users_created_user', 'wp_send_new_user_notifications' );
remove_action( 'network_user_new_created_user', 'wp_send_new_user_notifications' );

// Add them back (if needed), but only for the user
add_action( 'network_site_new_created_user', 'my_wp_send_new_user_notifications' );
add_action( 'network_site_users_created_user', 'my_wp_send_new_user_notifications' );
add_action( 'network_user_new_created_user', 'my_wp_send_new_user_notifications' );

function change_network_wp_send_new_user_notifications( $user_id ) {
	wp_new_user_notification( $user_id, null, 'user' );
}