PHP 文档

<?php
   $channel =<<<_XML_

   <channel>
      <title>What's For Dinner</title>
      <link>http://menu.example.com/ </link>
      <description>Choose what to eat tonight.</description>
   </channel>
_XML_;

   echo <<<END
   This uses the "here document" syntax to output multiple lines with variable
   interpolation. Note that the here document terminator must appear on a line with
   just a semicolon. no extra whitespace!


END;

   print $channel;
?>