What is the difference between EOT and HTML? in PHP
<p>I've seen some people using this code.</p>

<pre><code>echo &lt;&lt;&lt; EOT
Hi &lt;br&gt;
EOT;
</code></pre>

<p>and</p>

<pre><code>echo &lt;&lt;&lt; HTML
Hello&lt;br&gt;
HTML;
</code></pre>

<p>What's the difference of those two? and why would not they use the normal echo? like</p>

<pre><code>echo "How are you&lt;br&gt;"?
</code></pre>
