Gnupg in PHP5 does not print in browser, but works in terminal?

Question

I’m having a problem in PHP that I’ve never seen before, I’m using the Gnupg class to generate encrypted messages, however I can’t use in browser, I was wondering why but I can’t come to the conclusion, maybe security, the generated variable is always empty in the browser, but in the terminal is printed perfectly.

Code:

<?php

  $text = "ISSO É UM TESTE";

  $enc = encrypt($text);

  print $enc;

  function encrypt($text){
      $gpg = new gnupg();
      $gpg->addencryptkey("KEY_AQUI");
      $enc = $gpg->encrypt("$text");
      return $enc;
  }

?>

In the browser, it just doesn’t work, the page is empty, in the terminal with results, as in the image below: