$x="<p>html</p>"; echo $x;

echo "<p>html</p>";

echo '<p>HTML</p>';

$x = "<p>html</p>";
echo htmlentities($x);

<p>html</p>

$x = "<p>html</p>";
echo html_entity_decode($x);

html

$x = "<p>html</p>";
echo strip_tags($x);

html