div hide in php
$id=$this->session->userdata('user_id');
<ul class="nav nav-pills">
<?php if(isset($id)){ ?>
<style type="text/css">#settings{
display:none;
} #activity{
display:inline-block;
}</style>
<li class="nav-item"><a class="nav-link active" href="#activity" data-toggle="tab">Activity</a></li>
<?php }else{ ?>
<style type="text/css">#activity{
display:none;
} #settings{
display:inline-block;
}</style>
<li class="nav-item"><a class="nav-link active" href="#settings" data-toggle="tab">Settings</a></li>
<?php } ?>
</ul>
<div class="tab-pane" id="activity">Activity</div>
<div class="tab-pane" id="settings">Settings</div>