Wordpress Custom Login / Mechanizm Logowanie

// Custom Login Engine

function custom_login() {

    global $errors;


    if  ( isset( $_POST['submit'] ) && ( $_POST['submit'] == 'submit' )) {

        if ( ! isset( $_POST['czystespalanie__nonce__field'] ) || ! wp_verify_nonce( $_POST['czystespalanie__nonce__field'], 'czystespalanie__nonce__cf_msg' )) {

           print '<h1>Sorry, but <strong><i>something went wrong.</i></strong> Contact with admin </h1>';
           return;
        }

        $res = czystespalanie__post_captcha( $_POST['g-recaptcha-response'] );

        if ( !$res['success'] ){
            $errors = 'Udowodnij, że nie jesteś robotem i zaznacz pole reCaptcha lub wykonaj instrukcje z obrazka.';
        } else {

            $login_data = array();
            $login_data['user_login'] = sanitize_user($_POST['log']);
            $login_data['user_password'] = esc_attr($_POST['pwd']);

            $user = wp_signon( $login_data, false );

            if ( is_wp_error( $user ) ) {

                $errors = 'Niepoprawny login lub hasło.';

            } else {

                wp_clear_auth_cookie();

                wp_set_current_user( $user->ID, $user->user_login );
                wp_set_auth_cookie( $user->ID );

                $redirect_to = ( is_array( $user->roles ) && in_array( 'administrator', $user->roles ) ) ? admin_url() : home_url('/forum');

                wp_safe_redirect( $redirect_to );
                exit;
            }
        }
    }
}