php截取utf8或gbk编码中英文字符串

3. //字符串截取

4. $a = "s＠@你好";
5. var_dump(strlen_weibo($a,'utf-8'));
6. 结果输出为8，其中字母s计数为1，全角＠计数为2，半角@计数为1，两个中文计数为4。源码如下：

7. //截取字符串的函数代码

8. function strlen_weibo($string, $charset='utf-8')
9. {
10. $n = $count = 0;
11. $length = strlen($string);
12. if (strtolower($charset) == 'utf-8')
13. {
14. while ($n {
15. $currentByte = ord($string[$n]);
16. if ($currentByte == 9 ||
17. $currentByte == 10 ||
18. (32 {
19. $n++;
20. $count++;
21. } elseif (194 {
22. $n += 2;
23. $count += 2;
24. } elseif (224 {
25. $n += 3;
26. $count += 2;
27. } elseif (240 {
28. $n += 4;
29. $count += 2;
30. } elseif (248 {
31. $n += 5;
32. $count += 2;
33. } elseif ($currentByte == 252 || $currentByte == 253)
34. {
35. $n += 6;
36. $count += 2;
37. } else
38. {
39. $n++;
40. $count++;
41. }
42. if ($count >= $length)
43. {
44. break;
45. }
46. }
47. return $count;
48. } else
49. {
50. for ($i = 0; $i {
51. if (ord($string[$i]) > 127)
52. {
53. $i++;
54. $count++;
55. }
56. $count++;
57. }
58. return $count;
59. }
60. }

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