保持最大长度，且文字完整
只支持GBK，UTF8的先转GBK再执行
function gbk_left($str,$len){<br>
if(strlen($str)
$txt='';<br>
for($i=0;$i
if(ord($str{$i})>0x80){<br>
if($i+1==$len) return $txt;<br>
$txt.=$str{$i}.$str{$i+1};<br>
$i++;<br>
continue;<br>
}<br>
$txt.=$str{$i};<br>
}<br>
return $txt;<br>
}
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