PHP Comments

[AFPoster]

So I'm attempting to add comments around certain lines of code in my Index.php file and for some reason they're still showing on my site. Any help would be greatly appreciated, code is below:

PHP Code:

/* This button to be hidden for now
<a class="btn btn-warning" href="#">Hello</a>
don't remove until proper approval */ 


I've also tried:

PHP Code:

#This button to be hidden for now <a class="btn btn-warning" href="#">Hello</a> 


Making sure this one is all on 1 line.