1. 截取GB2312中文字符串

<?php
< ?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
< ?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);
}
?>
3. UTF-8、GB2312都支持的汉字截取函数

<?php
< ?php
/*?
Utf-8、gb2312都支持的汉字截取函数?
cut_str(字符串, 截取长度, 开始长度, 编码);?
编码默认为 utf-8?
开始长度默认为 0?
*/?
?
function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')?
{?
??? if($code == 'UTF-8')?
??? {?
??????? $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";?
??????? preg_match_all($pa, $string, $t_string);?
?
??????? if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
??????? return join('', array_slice($t_string[0], $start, $sublen));?
??? }?
??? else?
??? {?
??????? $star