- //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);
- }
- ?>
2、UTF-8、GB2312都支持的汉字截取函数
- 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
- {
- $start = $start*2;
- $sublen = $sublen*2;
- $strlen = strlen($string);
- $tmpstr = '';
-
- for($i=0;$i<$strlen;$i++)
- {
- if($i>=$start && $i<($start+$sublen))
- {
- if(ord(substr($string, $i, 1))>129)
- {
- $tmpstr.= substr($string, $i, 2);
- }
- else
- {
- $tmpstr.= substr($string, $i, 1);
- }
- }
- if(ord(substr($string, $i, 1))>129)$i++;
- }
- if(strlen($tmpstr)<$strlen )$tmpstr.= "...";
- return $tmpstr;
- }
- }
- $str = "abcd需要截取的字符串";
- echo cut_str($str, 8, 0, 'gb2312');
- ?>
3、BugFree 的字符截取函数
- function sysSubStr($String,$Length,$Append = false)
- {
- if (strlen($String)<= $Length )
- {
- return $String;
- }
- else
- {
- $I = 0;
- while ($I < $Length)
- {
- $StringTMP = substr($String,$I,1);
- if (ord($StringTMP)>=224 )
- {
- $StringTMP = substr($String,$I,3);
- $I = $I + 3;
- }
- elseif(ord($StringTMP)>=192 )
- {
- $StringTMP = substr($String,$I,2);
- $I = $I + 2;
- }
- else
- {
- $I = $I + 1;
- }
- $StringLast[]= $StringTMP;
- }
- $StringLast = implode("",$StringLast);
- if($Append)
- {
- $StringLast .= "...";
- }
- return $StringLast;
- }
- }
- $String = "CodeBit.cn -- 简单、精彩、通用";
- $Length = "18";
- $Append = false;
- echo sysSubStr($String,$Length,$Append);
- ?>
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