PHP Chinese string interception function supports multiple encodings

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Release: 2016-07-25 09:04:23
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  1. /*

  2. * @todo Chinese interception, support gb2312, gbk, utf-8, big5
  3. * @http://bbs.it-home.org
  4. * @param string $str The string to be intercepted
  5. * @param int $start The interception starting position
  6. * @param int $length The interception length
  7. * @param string $charset utf-8|gb2312|gbk|big5 encoding
  8. * @ param $suffix whether to add a suffix
  9. */

  10. function csubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)

  11. {
  12. if(function_exists("mb_substr"))
  13. return mb_substr($str, $start, $length, $charset);
  14. $re['utf-8'] = "/[x01-x7f]|[xc2-xdf ][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
  15. $re['gb2312'] = "/[x01 -x7f]|[xb0-xf7][xa0-xfe]/";
  16. $re['gbk'] = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
  17. $re ['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
  18. preg_match_all($re[$charset], $str, $match) ;
  19. $slice = join("",array_slice($match[0], $start, $length));
  20. if($suffix) return $slice."…";
  21. return $slice;
  22. }
  23. ?> ;
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