php之smarty篇（三）变量操作符
capitalize [首字母大写] count_characters [计算字符数] cat [连接字符串] count_paragraphs [计算段落数] count_sentences [计算句数] count_words [计算词数] date_format [时间格式] default [默认] escape [转码] indent[缩进] lower[小写 ] nl2br[换行符替换成
] 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]