PHP - user credential condition

Question

<div class="button-container">
  <?php if(!$is_login){?>
  <a href="/login" type="button" class="btn-login">LOGIN</a> / <a href="/register" type="button" class="btn-signup">SIGNUP</a>
  <?php }else{?>
    <button type="button" class="btn-login btn-logout" onclick="logout()"><i class="material-icons power-btn">power_settings_new</i> LOGOUT</button>
  <?php }?>
</div>