smarty连接字符串

PHP通过“？”连接字符串，Java通过“.”连接字符串，smarty连接字符串如何实现呢？

查了查手册，发现：smarty连接字符串通过的是关键字:cat。

例如：

index.php:

$smarty = new Smarty; 

$smarty->assign('articleTitle', "Psychics predict world didn't end");

$smarty->display('index.tpl');

index.tpl:

{$articleTitle|cat:" yesterday."}

OUTPUT:

Psychics predict world didn't end yesterday.