王明昌博客msubstr(str,start=0, length,charset=”utf-8″, suffix=true)str:要截取的字符串
start=0：开始位置，默认从0开始length：截取长度
charset=”utf-8″：字符编码，默认UTF－8suffix=true：是否在截取后的字符后面显示省略号，默认true显示，false为不显示
调用如下
{vo.title|msubstr=5,5,’utf-8′,false} 解释：截取字符串vo.title，从第5个字符开始，截取5个，编码为UTF－8，不显示省略号
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function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=false){ if(function_exists("mb_substr")){ if($suffix) return mb_substr($str, $start, $length, $charset)."..."; else return mb_substr($str, $start, $length, $charset); }elseif(function_exists('iconv_substr')) { if($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) return $slice."…"; return $slice; } |
