How to put meta name="robots" on technical domain address?

Question

PHP

The site is available at the address of the technical domain http://43346.domain.ru. It is necessary to insert a meta tag on all its pages.
Or how can you display this label in the head script, for a specific address?

Answer 1

<?php
if ($_SERVER['SERVER_NAME'] === '43346.домен.ru') {
  echo '<meta name="robots">';
}

Just in case, check what is stored in this variable - the value may differ depending on the environment settings.