php 截取中文字符

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<?php
/*
*截取字符串
*bilibo@2011-06-23
*/
class StringHelper extends AppHelper {
function CutStr($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 )
return $tmpstr;
}
}
}
?>