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phpsubstr截断中文半个汉字乱码问题的解决方法

时间：2021-07-01 10:21:17 帮助过：11人阅读

  2. /**
  3. * 改进的substr
  4. * edit bbs.it-home.org
  5. */
  6. function getstr($string, $length, $encoding = 'utf-8') {
  7. $string = trim($string);
  8. if($length && strlen($string) > $length) {
  9. //截断字符
  10. $wordscut = '';
  11. if(strtolower($encoding) == 'utf-8') {
  12. //utf8编码
  13. $n = 0;
  14. $tn = 0;
  15. $noc = 0;
  16. while ($n < strlen($string)) {
  17. $t = ord($string[$n]);
  18. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
  19. $tn = 1;
  20. $n++;
  21. $noc++;
  22. } elseif(194 <= $t && $t <= 223) {
  23. $tn = 2;
  24. $n += 2;
  25. $noc += 2;
  26. } elseif(224 <= $t && $t < 239) {
  27. $tn = 3;
  28. $n += 3;
  29. $noc += 2;
  30. } elseif(240 <= $t && $t <= 247) {
  31. $tn = 4;
  32. $n += 4;
  33. $noc += 2;
  34. } elseif(248 <= $t && $t <= 251) {
  35. $tn = 5;
  36. $n += 5;
  37. $noc += 2;
  38. } elseif($t == 252 || $t == 253) {
  39. $tn = 6;
  40. $n += 6;
  41. $noc += 2;
  42. } else {
  43. $n++;
  44. }
  45. if ($noc >= $length) {
  46. break;
  47. }
  48. }
  49. if ($noc > $length) {
  50. $n -= $tn;
  51. }
  52. $wordscut = substr($string, 0, $n);
  53. } else {
  54. for($i = 0; $i < $length - 1; $i++) {
  55. if(ord($string[$i]) > 127) {
  56. $wordscut .= $string[$i].$string[$i + 1];
  57. $i++;
  58. } else {
  59. $wordscut .= $string[$i];
  60. }
  61. }
  62. }
  63. $string = $wordscut;
  64. }
  65. return trim($string);
  66. }
  67. ?>

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