在PHP中使用<<< EOD有什么用？

Question

I am implementing node to PDF using drupal and tcpdf. In such case i am suppose to use this <<<EOD tag. If i didn't give this o/p is not perfect. I can't exactly get the purpose of <<<EOD.

Could anybody please explain the concept of this?

$html = <<<EOD
        <tr>
          <td>TEST</td>
        </tr>
EOD;

Thanks in advance....

Answer 1

That is not HTML, but PHP. It is called the HEREDOC string method, and is an alternative to using quotes for writing multiline strings.

The HTML in your example will be:

    <tr>
      <td>TEST</td>
    </tr>

Read the PHP documentation that explains it.