thinkphp 模板时间操作、字符切割 条件判断

1.view模板时间转换

     1.1.转换成时间戳：<{"2017-11-20"|date="Y-m-d"}>

     1.2.将时间转换任意格式：<{"2017-11-20"|strtotime|date="Y-m-d",###}>

     1.3.如果mysql里日期有空，就用默认的： <{$data.time|default=time()|date="Y-m-d",###}>

2.view模板字符过长截取：

view下修改：<{$data.content|msubstr=###,0,25,"utf-8",false}>
function下修改：添加一函数：

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {
        if(function_exists("mb_substr"))
            $slice = mb_substr($str, $start, $length, $charset);
        elseif(function_exists("iconv_substr")) {
            $slice = iconv_substr($str,$start,$length,$charset);
            if(false === $slice) {
                $slice = "";
            }
        }else{
            $re["utf-8"]   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
            $re["gb2312"] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
            $re["gbk"]    = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
            $re["big5"]   = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
            preg_match_all($re[$charset], $str, $match);
            $slice = join("",array_slice($match[0], $start, $length));
        }
        $fix="";
        if(strlen($slice) < strlen($str)){
            $fix="...";
        }
        return $suffix ? $slice.$fix : $slice;
    }

3.view下的条件判断
<if condition="$data["contnet] neq " " "><else/></if>  //判断空或非空，注意判断符号不能直接用“<; >; >=; <=; =;”