PHP技术分享--实现中文字串截取无乱码的函数(适用于utf-8)

// 实现中文字串截取无乱码的函数(适用于utf-8)

function substr_text($str, $start=0, $length, $charset="utf-8", $suffix="")

{

if(function_exists("mb_substr"))

{

// 判断中文长度,超过指定长度超出部分显示...

if (mb_strlen($str,$charset)>$length)

{

return mb_substr($str, $start, $length, $charset).$suffix.'...';

}

else

{

return mb_substr($str, $start, $length, $charset).$suffix;

}

}

elseif(function_exists('iconv_substr'))

{

// 判断中文长度,超过指定长度超出部分显示...

if (mb_strlen($str,$charset)>$length)

{

return iconv_substr($str,$start,$length,$charset).$suffix.'...';

}

else

{

return iconv_substr($str,$start,$length,$charset).$suffix;

}

}

$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));

return $slice.$suffix;

}

echo substr_text('菜单测试',0,2);

?>