php substr截断中文半个汉字乱码问题的解决方法

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 $t = ord($string[$n]);
17. if($t == 9 || $t == 10 || (32 $tn = 1;
18. $n++;
19. $noc++;
20. } elseif(194 $tn = 2;
21. $n += 2;
22. $noc += 2;
23. } elseif(224 $tn = 3;
24. $n += 3;
25. $noc += 2;
26. } elseif(240 $tn = 4;
27. $n += 4;
28. $noc += 2;
29. } elseif(248 $tn = 5;
30. $n += 5;
31. $noc += 2;
32. } elseif($t == 252 || $t == 253) {
33. $tn = 6;
34. $n += 6;
35. $noc += 2;
36. } else {
37. $n++;
38. }
39. if ($noc >= $length) {
40. break;
41. }
42. }
43. if ($noc > $length) {
44. $n -= $tn;
45. }
46. $wordscut = substr($string, 0, $n);
47. } else {
48. for($i = 0; $i if(ord($string[$i]) > 127) {
49. $wordscut .= $string[$i].$string[$i + 1];
50. $i++;
51. } else {
52. $wordscut .= $string[$i];
53. }
54. }
55. }
56. $string = $wordscut;
57. }
58. return trim($string);
59. }
60. ?>

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