user_(field) filter-hook . WP 2.9.0

Filters the value of a user field in a standard context.

The dynamic portion of the hook name, $field, refers to the prefixed user field being filtered, such as 'user_login', 'user_email', 'first_name', etc.

Usage

add_filter( 'user_(field)', 'filter_function_name_5021', 10, 3 );
function filter_function_name_5021( $value, $user_id, $context ){
	// filter...

	return $value;
}

$value(mixed)

The user object value to sanitize.

$user_id(int)

User ID.

$context(string)

The context to filter within.

Where the hook is called

$value = apply_filters( "user_{$field}", $value, $user_id, $context );

Where the hook is used (in WP core)

add_action( 'user_register', array( 'WP_Internal_Pointers', 'dismiss_pointers_for_new_users' ) );

add_action( 'user_admin_notices', 'new_user_email_admin_notice' );

add_action( 'user_request_action_confirmed', '_wp_privacy_account_request_confirmed' );

add_action( 'user_request_action_confirmed', '_wp_privacy_send_request_confirmation_notification', 12 ); // After request marked as completed.

add_filter( 'user_has_cap', 'wp_maybe_grant_install_languages_cap', 1 );