print <<< END
It's funny when signs say things like:
   Original "Root" Beer
   "Free" Gift
   Shoes cleaned while "you" wait
or have other misquoted words.
END;

heredoc定义的例子

print <<< PARSLEY
It's easy to grow fresh:
Parsley
Chives
on your windowsill
PARSLEY;

print <<< DOGS
If you like pets, yell out:
DOGS AND CATS ARE GREAT!
DOGS;

连接一个heredoc定义的字符串

$html = <<< END
<div class="$divClass">
<ul class="$ulClass">
<li>
END
. $listItem . '</li></div>';

print $html;

用heredoc定义的方式来输出HTML

if ($remaining_cards > 0) {
    $url = '/deal.php';
    $text = 'Deal More Cards';
} else {
    $url = '/new-game.php';
    $text = 'Start a New Game';
}
print <<< HTML
There are <b>$remaining_cards</b> left.
<p>
<a href="$url">$text</a>
HTML;