PHP中实现中文字串截取无乱码的方法

function substr_text($str, $start=0, $length, $charset="utf-8", $suffix="")
{
	if(function_exists("mb_substr")){
	return mb_substr($str, $start, $length, $charset).$suffix;
	}
	elseif(function_exists('iconv_substr')){
	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;
}

 

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