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php截取utf8或gbk编码中英文字符串

时间：2021-07-01 10:21:17 帮助过：22人阅读

  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 < $length)
  15. {
  16. $currentByte = ord($string[$n]);
  17. if ($currentByte == 9 ||
  18. $currentByte == 10 ||
  19. (32 <= $currentByte && $currentByte <= 126)) // bbs.it-home.org
  20. {
  21. $n++;
  22. $count++;
  23. } elseif (194 <= $currentByte && $currentByte <= 223)
  24. {
  25. $n += 2;
  26. $count += 2;
  27. } elseif (224 <= $currentByte && $currentByte <= 239)
  28. {
  29. $n += 3;
  30. $count += 2;
  31. } elseif (240 <= $currentByte && $currentByte <= 247)
  32. {
  33. $n += 4;
  34. $count += 2;
  35. } elseif (248 <= $currentByte && $currentByte <= 251)
  36. {
  37. $n += 5;
  38. $count += 2;
  39. } elseif ($currentByte == 252 || $currentByte == 253)
  40. {
  41. $n += 6;
  42. $count += 2;
  43. } else
  44. {
  45. $n++;
  46. $count++;
  47. }
  48. if ($count >= $length)
  49. {
  50. break;
  51. }
  52. }
  53. return $count;
  54. } else
  55. {
  56. for ($i = 0; $i < $length; $i++)
  57. {
  58. if (ord($string[$i]) > 127)
  59. {
  60. $i++;
  61. $count++;
  62. }
  63. $count++;
  64. }
  65. return $count;
  66. }
  67. }

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