echo "<div> \n
         <p> \n
             text bla bla \n
         </p> \n
      </div> \n
     ";

$var .= "<div>\n";
$var .= "	<p>\n";
$var .= "		text bla bla\n";
$var .= "	</p>\n";
$var .= "</div>\n";

echo "
<div>
	<p>
		text bla bla
	</p>
</div>\n";