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String interception

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2016-07-25 09:08:35884browse
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  1. /**
  2. * 字符截取 支持UTF8/GBK
  3. * @param $string
  4. * @param $length
  5. * @param $dot
  6. */
  7. function str_cut($string, $length, $dot = '...') {
  8. $strlen = strlen($string);
  9. if($strlen <= $length) return $string;
  10. $string = str_replace(array(' ',' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array('∵',' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);
  11. $strcut = '';
  12. if(strtolower(CHARSET) == 'utf-8') {
  13. $length = intval($length-strlen($dot)-$length/3);
  14. $n = $tn = $noc = 0;
  15. while($n < strlen($string)) {
  16. $t = ord($string[$n]);
  17. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
  18. $tn = 1; $n++; $noc++;
  19. } elseif(194 <= $t && $t <= 223) {
  20. $tn = 2; $n += 2; $noc += 2;
  21. } elseif(224 <= $t && $t <= 239) {
  22. $tn = 3; $n += 3; $noc += 2;
  23. } elseif(240 <= $t && $t <= 247) {
  24. $tn = 4; $n += 4; $noc += 2;
  25. } elseif(248 <= $t && $t <= 251) {
  26. $tn = 5; $n += 5; $noc += 2;
  27. } elseif($t == 252 || $t == 253) {
  28. $tn = 6; $n += 6; $noc += 2;
  29. } else {
  30. $n++;
  31. }
  32. if($noc >= $length) {
  33. break;
  34. }
  35. }
  36. if($noc > $length) {
  37. $n -= $tn;
  38. }
  39. $strcut = substr($string, 0, $n);
  40. $strcut = str_replace(array('∵', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), array(' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), $strcut);
  41. } else {
  42. $dotlen = strlen($dot);
  43. $maxi = $length - $dotlen - 1;
  44. $current_str = '';
  45. $search_arr = array('&',' ', '"', "'", '“', '”', '—', '<', '>', '·', '…','∵');
  46. $replace_arr = array('&',' ', '"', ''', '“', '”', '—', '<', '>', '·', '…',' ');
  47. $search_flip = array_flip($search_arr);
  48. for ($i = 0; $i < $maxi; $i++) {
  49. $current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
  50. if (in_array($current_str, $search_arr)) {
  51. $key = $search_flip[$current_str];
  52. $current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);
  53. }
  54. $strcut .= $current_str;
  55. }
  56. }
  57. return $strcut.$dot;
  58. }
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