php中的  <<< 是定界符，在定界符后紧跟标示符，然后是自定义的字符串信息，最后跟标示符+分号。如何使用这里举个栗子：

<?php
$date = date("Y-m-d H:i:s");

$str = <<<EOT
"Time is going"
Time is printf time: %s

EOT;
printf($str$date);


echo <<<SUI_BIAN
This is echo time: $date

SUI_BIAN;

结果是：

"Time is going"
Time is printf time: 2015-07-24 16:24:31
This is echo time: 2015-07-24 16:24:31

很好用的，是吧