变量调节器后补篇

   今天老师又接着昨天的知识来把变量调节器讲完。
所有的变成小写：lower           将变量字符串小写
       $smarty = new Smarty;
       $smarty->assign('articleTitle', 'Two Convicts Evade Noose, Jury Hung.');
       $smarty->display('index.tpl');
index.tpl:
       {$articleTitle}
       {$articleTitle|lower}
替换：replace       简单的搜索和替换字符串
       $smarty = new Smarty;
       $smarty->assign('articleTitle', "Child's Stool Great for Use in Garden.");
       $smarty->display('index.tpl');
index.tpl:
       {$articleTitle}
       {$articleTitle|replace:"Garden":"Vineyard"}
       {$articleTitle|replace:" ":" "}
所有字符大写：upper       将变量改为大写
       $smarty = new Smarty;
       $smarty->assign('articleTitle', "If Strike isn't Settled Quickly it may Last a While.");
       $smarty->display('index.tpl');
index.tpl:
       {$articleTitle}
       {$articleTitle|upper}