title: PHP expression <<<EOB
body: <p>I've been developing with PHP for some years now, and recently came across this code:</p>
  
  <pre><code>&lt;?php
      echo &lt;&lt;&lt;EOB
          &lt;html&gt;
          &lt;head&gt;
              &lt;title&gt;My title&lt;/title&gt;
          &lt;/head&gt;
          ...
      EOB;
  ?&gt;
  </code></pre>
  
  <p>I've never seen this approach to print HTML, which seems to be pretty useful and less prone to some weird variable or double quote syntax error.</p>
  
  <p>I've searched for some official information about this and only found a post of Rasmus talking about this.</p>
  
  <p>What is a detailed explanation about this functionality and what does EOB mean? Maybe <em>end of block</em>?</p>