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PHP function to calculate the length of Chinese string and intercept Chinese string

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Release: 2016-07-25 09:04:17
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  1. header('Content-type:text/html;charset=utf-8');
  2. /**
  3. * Function to count the length of Chinese strings
  4. * @param $str The string to calculate the length
  5. * @param $type Calculation length type, 0 (default) means one Chinese character is counted as one character, 1 means one Chinese character is counted as two characters
  6. * @http://bbs.it-home.org
  7. *
  8. */
  9. function abslength($str)
  10. {
  11. if( empty($str)){
  12. return 0;
  13. }
  14. if(function_exists('mb_strlen')){
  15. return mb_strlen($str,'utf-8');
  16. }
  17. else {
  18. preg_match_all("/./ u", $str, $ar);
  19. return count($ar[0]);
  20. }
  21. }
  22. $str = 'Script Academy welcomes everyone, ye! ';
  23. $len = abslength($str);
  24. var_dump($len); //return 12
  25. $len = abslength($str,'1');
  26. echo '
    '.$len ; //return 22
  27. /*
  28. utf-8 encoding to intercept Chinese strings, the parameters can refer to the substr function
  29. @param $str The string to be intercepted
  30. @param $start The starting position to be intercepted, negative numbers are inverse To intercept
  31. @param $end The length to be intercepted
  32. */
  33. function utf8_substr($str,$start=0) {
  34. if(empty($str)){
  35. return false;
  36. }
  37. if (function_exists(' mb_substr')){
  38. if(func_num_args() >= 3) {
  39. $end = func_get_arg(2);
  40. return mb_substr($str,$start,$end,'utf-8');
  41. }
  42. else {
  43. mb_internal_encoding("UTF-8");
  44. return mb_substr($str,$start);
  45. }
  46. }
  47. else {
  48. $null = "";
  49. preg_match_all("/./u", $str, $ ar);
  50. if(func_num_args() >= 3) {
  51. $end = func_get_arg(2);
  52. return join($null, array_slice($ar[0],$start,$end));
  53. }
  54. else {
  55. return join($null, array_slice($ar[0],$start));
  56. }
  57. }
  58. }
  59. $str2 = 'wo wants to intercept zhongwen';
  60. echo '
    ';
  61. echo utf8_substr($str2,0,-4); //return wo want to intercept zhon
  62. ?>
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2. Support gb2312, gbk, utf-8, big5 Chinese interception method

  1. /*
  2. * Chinese interception, supports gb2312, gbk, utf-8, big5
  3. * bbs.it-home.org
  4. * @param string $str The string to be intercepted
  5. * @param int $start interception starting position
  6. * @param int $length interception length
  7. * @param string $charset utf-8|gb2312|gbk|big5 encoding
  8. * @param $suffix whether to add a suffix
  9. */
  10. public function csubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
  11. {
  12. if(function_exists("mb_substr"))
  13. {
  14. if(mb_strlen($str , $charset) <= $length) return $str;
  15. $slice = mb_substr($str, $start, $length, $charset);
  16. }
  17. else
  18. {
  19. $re['utf-8'] = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
  20. $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
  21. $re['gbk'] = "/[x01-x7f]|[x81-xfe ][x40-xfe]/";
  22. $re['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
  23. preg_match_all($ re[$charset], $str, $match);
  24. if(count($match[0]) <= $length) return $str;
  25. $slice = join("",array_slice($match[0] , $start, $length));
  26. }
  27. if($suffix) return $slice."…";
  28. return $slice;
  29. }
  30. ?>
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