I've seen HTML nested within a PHP page written in so many ways... some of which are demonstrated in this page: http://austingulati.com/2010/01/many-ways-to-integrate-html-into-php/

But... I very rarely see HTML and PHP written in unison as follows:

echo <<<EOF
<h1>Welcome</h1>
<p>Hello</p>
<p>{$somePHPVariable}</p>
EOF;

Question:

Is there a fundamental issue with using the EOF approach that I should be aware of?