截图多余字符，中英文，避免截取中文乱码

截图多余字符，中英文都可以，避免截取中文结尾 ？？ 乱码！！

1. function utf8_strlen($string = null) {
2. // 将字符串分解为单元
3. preg_match_all('/./us', $string, $match);
4. // 返回单元个数
5. return count($match[0]);
6. }
7. function sub_content($content, $length){
8. $len = utf8_strlen($content);
9. for($i = 0 ; $i $arr[$i] = mb_substr($content,$i,1,'utf-8');
10. }
11. $get_length = 0;
12. $result = '';
13. foreach($arr as $code){
14. $result .= $code;
16. if(strlen($code) > 1){
17. $get_length += 2;
18. }else{
19. $get_length += 1;
20. }
21. if($get_length >= $length){
22. break;
23. }
24. }
25. return $result;
26. }
27. echo sub_content($rows["Description"],18);
31. /**
32. * 字符串截取，支持中文和其他编码
33. * @param string $str
34. * @param int $start
35. * @param int $length
36. * @param string $charset
37. * @param boolean $suffix
38. * @return string
39. */
40. function w_substr($str, $start = 0, $length, $charset = "utf-8", $suffix = TRUE) {
41. $suffix_str = $suffix ? '…' : '';
42. if(function_exists('mb_substr')) {
43. return mb_substr($str, $start, $length, $charset) . $suffix_str;
44. } elseif(function_exists('iconv_substr')) {
45. return iconv_substr($str, $start, $length, $charset) . $suffix_str;
46. } else {
47. $pattern = array();
48. $pattern['utf-8'] = '/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/';
49. $pattern['gb2312'] = '/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/';
50. $pattern['gbk'] = '/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/';
51. $pattern['big5'] = '/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/';
52. preg_match_all($pattern[$charset], $str, $matches);
53. $slice = implode("", array_slice($matches[0], $start, $length));
54. return $slice . $suffix_str;
55. }
56. }

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