I have the following bootstrap CDN included in my project
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
And I tried to echo glyphicons the following way within my php script
echo '<div class="col-sm"><span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>'.$deviceName.'</div>';
But nothing is showing up. Does anyone knows why?