php中文截取无乱码
<?php header(‘Content-Type:text/html;charset=utf-8‘); function cutstr($str,$len){ if($len<0){return null;} $chars = 0; //字符数量 $offset = 0; $res = ‘‘; while($chars < $len){ $high = decbin(ord(substr($str,$offset,1))); if(strlen($high) < 8){ $count = 1; }else if(substr($high,0,3) == ‘110‘){ $count = 2; }else if(substr($high,0,4)== ‘1110‘){ $count = 3; } echo $count.‘<br/>‘; $res .= substr($str,$offset,$count); $chars += 1; $offset += $count; } return $res; } $str = ‘你好aaaaa‘; echo cutstr($str,2); ?>
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