求教，怎么判断是否是低字节

求教，如何判断是否是低字节？

<?php<br />
header("content-type:text/html;charset=gbk");<br />
$str="j这是ces测试dkfjdksj";<br />
<br />
function substr_gbk($str,$start,$end)<br />
{<br />
	$temp="";<br />
	for($i=$start;$i<=$end;$i++)<br />
	{<br />
		if(ord($str{$i})>0xa0)<br />
		{<br />
			$temp.=substr($str,$i,2);<br />
			$i++;<br />
		}else<br />
		{<br />
			$temp.=substr($str,$i,1);<br />
		}<br />
	}<br />
	return $temp;<br />
}<br />
<br />
echo substr_gbk($str,1,10); //从高字节截取正常<br />
echo substr_gbk($str,2,10); //从低字节截取出现乱码<br />
?><br />

以上代码从高字节截取没有问题，但如果从低字节截取出现乱码
请问有知道如果判断高低字节的办法吗？

分享到：

------解决方案--------------------

本帖最后由 xuzuning 于 2013-10-30 11:08:53 编辑

$str="j这是ces测试dkfjdksj";<br />
 <br />
function substr_gbk($str,$start,$end)<br />
{<br />
    $temp="";<br />
    for($i=0; $i<$start; $i++) if(ord($str{$i})>0xa0) $i++; //加上这行<br />
    for(;$i<=$end;$i++)<br />
    {<br />
        if(ord($str{$i})>0xa0)<br />
        {<br />
            $temp.=substr($str,$i,2);<br />
            $i++;<br />
        }else<br />
        {<br />
            $temp.=substr($str,$i,1);<br />
        }<br />
    }<br />
    return $temp;<br />
}<br />
 <br />
echo substr_gbk($str,1,10); //这是ces测试<br />
echo substr_gbk($str,2,10); //是ces测试

Related labels：

gbk nbsp str substr temp

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