THINKPHP5截取標題長度並加省略號

首先在common.php文件寫下以下函數

/**
 *+----------------------------------------------------------
 * 字符串截取，支持中文和其餘編碼
 *+----------------------------------------------------------
 * @static
 * @access public
 *+----------------------------------------------------------
 * @param string $str 須要轉換的字符串
 * @param string $length 截取長度
 * @param string $start 開始位置
 * @param string $charset 編碼格式
 * @param string $suffix 截斷顯示字符
 *+----------------------------------------------------------
 * @return string
 *+----------------------------------------------------------
 */

 
function msubstr($str, $length, $start=0, $charset="utf-8", $suffix=false){
    if(function_exists("mb_substr")){
        $slice=mb_substr($str, $start, $length, $charset);
        if($suffix){
              if(mb_strlen($str,'utf-8')>$length){
                return $slice."...";
            }else{
                return $slice;
            }
        }else{
               return $slice;
        }
    }elseif(function_exists('iconv_substr')){
        if($suffix){
           return iconv_substr($str,$start,$length,$charset)."...";
        }else{
           return iconv_substr($str,$start,$length,$charset);
        }
    }

    $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, $length));         
    if($suffix) {
        if(strlen($slice)>$length){
             return $slice."…";
        }else{
             return $slice;
        }
    }
    return $slice;
}

函數建立完成，就能夠在前端模板直接使用了

{$v.title|msubstr= 50,0,‘utf-8’,true}

這樣就能夠截取固定長度的文字了