Here is my variable that I am actually getting from my MySQL Database:
<h1>This is a H1</h1>
// WHILE LOOP GETTING $ROW FROM MYSQL
$conContent = $row['content'];
Can you check the HTML source of the output? Is the HTML still around? It looks like
strip_tags() or HTMLPurifier removes your HTML. Otherwise you would either see the formatting applied or the tags in the output.
If you have HTML code in your database you don't have to do anything with it in PHP, but can directly print it.