Smarty核心内容：变量调节器

capitalize [首字符大写]
count_characters [字符计数]
cat [连接字符串]
count_paragraphs [计算段数]
count_sentences [计算句数]
count_words [计算词数]
date_format [格式化日期]
default [默认值]
escape [编码]
indent [缩进]
lower [小写]
nl2br [换行符替换成 <br />]
regex_replace [正则替换]
replace [替换]
spacify [插空]
string_format [字符串格式化]
strip [去除(多余空格)]
strip_tags [去除html标签]
truncate [截取]
upper [大写]
wordwrap [行宽约束]