字符串截取

来自PHPCMS

1. /**
2. * 字符截取 支持UTF8/GBK
3. * @param $string
4. * @param $length
5. * @param $dot
6. */
7. function str_cut($string, $length, $dot = '...') {
8. $strlen = strlen($string);
9. if($strlen $string = str_replace(array(' ',' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array('∵',' ', '&', '"', "'", '“', '”', '—', '', '·', '…'), $string);
10. $strcut = '';
11. if(strtolower(CHARSET) == 'utf-8') {
12. $length = intval($length-strlen($dot)-$length/3);
13. $n = $tn = $noc = 0;
14. while($n $t = ord($string[$n]);
15. if($t == 9 || $t == 10 || (32 $tn = 1; $n++; $noc++;
16. } elseif(194 $tn = 2; $n += 2; $noc += 2;
17. } elseif(224 $tn = 3; $n += 3; $noc += 2;
18. } elseif(240 $tn = 4; $n += 4; $noc += 2;
19. } elseif(248 $tn = 5; $n += 5; $noc += 2;
20. } elseif($t == 252 || $t == 253) {
21. $tn = 6; $n += 6; $noc += 2;
22. } else {
23. $n++;
24. }
25. if($noc >= $length) {
26. break;
27. }
28. }
29. if($noc > $length) {
30. $n -= $tn;
31. }
32. $strcut = substr($string, 0, $n);
33. $strcut = str_replace(array('∵', '&', '"', "'", '“', '”', '—', '', '·', '…'), array(' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), $strcut);
34. } else {
35. $dotlen = strlen($dot);
36. $maxi = $length - $dotlen - 1;
37. $current_str = '';
38. $search_arr = array('&',' ', '"', "'", '“', '”', '—', '', '·', '…','∵');
39. $replace_arr = array('&',' ', '"', ''', '“', '”', '—', '<', '>', '·', '…',' ');
40. $search_flip = array_flip($search_arr);
41. for ($i = 0; $i $current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
42. if (in_array($current_str, $search_arr)) {
43. $key = $search_flip[$current_str];
44. $current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);
45. }
46. $strcut .= $current_str;
47. }
48. }
49. return $strcut.$dot;
50. }

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