Session variable to hide/unhide button

I wish to use a session variable to hide a button that is in a column of 8 buttons. I have tried the following PHP code:

              <button class = "btn btn-info btn mt-2 my_specialbtn btn-lg" onclick="document.location='volscontactinfodirectory.php'">Add Database User</button>
        <?PHP }

I wan t this button to display if ‘pkey’ is 1 else hide it.

How do I do this?

Thanks in advance

Why don’t you just do in JavaScript?

var specialBtn = document.querySelector('.my_specialbtn');

specialBtn.addEventListener('click', function() {
  if ( === 'none') { = 'block';
  } else { = 'none';

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