php smarty 模板语言截取字符串，ThinkPHP ht

tp框架，smarty 截取字符串【truncate和substr】，写法

truncate：

{$str|truncate}

{$str|truncate:30}

{$str|truncate:30:""}

{$str|truncate:30:"---"}

{$str|truncate:30:"":true}

{$str|truncate:30:"...":true}

substr:

｛$str|substr=1｝ 

｛$str|substr=0,2｝ 

｛$str|substr=0,-2｝

｛$str|substr=-4｝

 { $str|msubstr=0,5,'utf-8'}