PHP string truncation (support Chinese)

<?php/** * String truncation (support Chinese) * @author: Zms * @version: 2011-7-27 *//** * String intercept * @param object $STR: String (Chinese supported) * @param object $start: Intercept start position * @param object $length: Intercept End Position * @param object $encode [OPTIONAL]: string encoding * @param object $input _encode [optional]: The encoding of the input text * @return */function substring ( $str, $start, $length, $encode = ' utf-8 ', $input _encode = ' utf-8 ') {//Encoding conversion $STR = Iconv ($input _encode           , $encode, $STR);           Regular matching Preg_match_all (Getrege ($encode), $str, $match);           The data is obtained from the array, consisting of a string $slice = Join ("", Array_slice ($match [0], $start, $length));       return $slice; }/** * Chinese code * @param object $type * @return * * function Getrege ($type) {$re           GE = ""; Switch (Strtolower ($type)) {case ' utf-8 ': $rege = "/[\x01-\x7f]|[ \xc2-\xdf][\x80-\xbf]| [\xe0-\xef] [\X80-\XBF] {2}| [\xf0-\xff][\x80-\xbf]{3}/";               Break Case ' gb2312 ': $rege = "/[\x01-\x7f]| [\xb0-\xf7]                   [\xa0-\xfe]/];               Break Case ' GBK ': $rege = "/[\x01-\x7f]| [\x81-\xfe]                   [\x40-\xfe]/];               Break Case "Big5": $rege = "/[\x01-\x7f]| [\x81-\xfe] ([\x40-\x7e]|\xa1-\xfe])                   /";               Break                   Default:echo "CharSet error";           Exit       } return $rege; }?>

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