Prevent user enumeration

gistfile1.txt

<?php
/**
 * Stop user enumeration.
 *
 * @package wpplugin
 */

if ( ! is_admin() ) {
	// phpcs:disable
	if ( preg_match( '/author=([0-9]*)/i', $_SERVER['QUERY_STRING'] ) ) {
		// phpcs:enable
		die();
	}
	add_filter( 'redirect_canonical', 'cafunc1_check_enum', 10, 2 );
}

/**
 * Stop user enumeration function.
 *
 * @param [type] $redirect Redirect url.
 * @param [type] $request Request parameter.
 * @return url redirect to home.
 */
function cafunc1_check_enum( $redirect, $request ) {
	if ( preg_match( '/\?author=([0-9]*)(\/*)/i', $request ) ) {
		die();
	} else {
		return $redirect;
	}
}