PHPsubistr截取字符串无码

更新时间：20120102

2. /**
3. * [WebodMin] (C)2010-2099 Blank Inc.
4. * This is NOT a freeware, use is subject to license terms
5. *
6. **/
8. function subistr($string, $length, $dot = ' ...') {
9. global $charset;
10. if(strlen($string) <= $length) {
11. return $string;
12. }
13. $s = '';
14. if(strtolower($charset) == 'utf-8') {
15. $n = $tn = $noc = 0;
16. while($n < strlen($string)) {
17. $t = ord($string[$n]);
18. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
19. $tn = 1; $n++; $noc++;
20. } elseif(194 <= $t && $t <= 223) {
21. $tn = 2; $n += 2; $noc += 2;
22. } elseif(224 <= $t && $t <= 239) {
23. $tn = 3; $n += 3; $noc += 2;
24. } elseif(240 <= $t && $t <= 247) {
25. $tn = 4; $n += 4; $noc += 2;
26. } elseif(248 <= $t && $t <= 251) {
27. $tn = 5; $n += 5; $noc += 2;
28. } elseif($t == 252 || $t == 253) {
29. $tn = 6; $n += 6; $noc += 2;
30. } else {
31. $n++;
32. }
33. if($noc >= $length) {
34. break;
35. }
36. }
37. if($noc > $length) {
38. $n -= $tn;
39. }
40. $s = substr($string, 0, $n);
41. } else {
42. for($i = 0; $i < $length; $i++) {
43. $s .= ord($string[$i]) >= 127 ? $string[$i].$string[++$i] : $string[$i];
44. }
45. }
46. return $s.$dot;
47. }