1、截取gb2312字符用的函数
php
//截取中文字符串
function mysubstr($str, $start, $len) {
$tmpstr = ;
$strlen = $start + $len;
for($i = 0; $i $strlen; $i++) {
if(ord(substr($str, $i, 1)) > 0xa0) {
$tmpstr .= substr($str, $i, 2);
$i++;
} else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr;
}
?>
2. 截取utf8编码的多字节字符串
php
//截取utf8字符串
function utf8substr($str, $from, $len)
{
return preg_replace('#^(?:[\x00-\x7f]|[\xc0-\xff][\x80-\xbf]+){0,'.$from.'}'.
'((?:[\x00-\x7f]|[\xc0-\xff][\x80-\xbf]+){0,'.$len.'}).*#s',
'$1',$str);
}
?>