四个php中文字符串截取函数

2. //截取中文字符串
3. function mysubstr($str, $start, $len) {
4. $tmpstr = "";
5. $strlen = $start + $len;
6. for($i = 0; $i < $strlen; $i++) {
7. if(ord(substr($str, $i, 1)) > 0xa0) {
8. $tmpstr .= substr($str, $i, 2);
9. $i++;
10. } else
11. $tmpstr .= substr($str, $i, 1);
12. }
13. return $tmpstr;
14. }
15. ?>

2、截取utf8编码的多字节字符串

2. < ?php
3. //截取utf8字符串
4. function utf8Substr($str, $from, $len)
5. {
6. return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.
7. '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',
8. '$1',$str);
9. }
10. ?>

3、UTF-8、GB2312都支持的汉字截取函数

2. < ?php
3. /*
4. @Utf-8、gb2312都支持的汉字截取函数
5. @cut_str(字符串, 截取长度, 开始长度, 编码);
6. @编码默认为 utf-8
7. @开始长度默认为 0
8. @http://bbs.it-home.org
9. */
10. function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')
11. {
12. if($code == 'UTF-8')
13. {
14. $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
15. preg_match_all($pa, $string, $t_string);
16. if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
17. return join('', array_slice($t_string[0], $start, $sublen));
18. }
19. else
20. {
21. $start = $start*2;
22. $sublen = $sublen*2;
23. $strlen = strlen($string);
24. $tmpstr = '';
25. for($i=0; $i< $strlen; $i++)
26. {
27. if($i>=$start && $i< ($start+$sublen))
28. {
29. if(ord(substr($string, $i, 1))>129)
30. {
31. $tmpstr.= substr($string, $i, 2);
32. }
33. else
34. {
35. $tmpstr.= substr($string, $i, 1);
36. }
37. }
38. if(ord(substr($string, $i, 1))>129) $i++;
39. }
40. if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
41. return $tmpstr;
42. }
43. }
44. $str = "abcd需要截取的字符串";
45. echo cut_str($str, 8, 0, 'gb2312');
46. ?>

4、BugFree 字符截取函数

2. < ?php
3. /**
4. * @package BugFree
5. * @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $
6. * @http://bbs.it-home.org
7. *
8. * Return part of a string(Enhance the function substr())
9. *
10. * @author Chunsheng Wang
11. * @param string $String the string to cut.
12. * @param int $Length the length of returned string.
13. * @param booble $Append whether append "...": false|true
14. * @return string the cutted string.
15. */
16. function sysSubStr($String,$Length,$Append = false)
17. {
18. if (strlen($String) < = $Length )
19. {
20. return $String;
21. }
22. else
23. {
24. $I = 0;
25. while ($I < $Length)
26. {
27. $StringTMP = substr($String,$I,1);
28. if ( ord($StringTMP) >=224 )
29. {
30. $StringTMP = substr($String,$I,3);
31. $I = $I + 3;
32. }
33. elseif( ord($StringTMP) >=192 )
34. {
35. $StringTMP = substr($String,$I,2);
36. $I = $I + 2;
37. }
38. else
39. {
40. $I = $I + 1;
41. }
42. $StringLast[] = $StringTMP;
43. }
44. $StringLast = implode("",$StringLast);
45. if($Append)
46. {
47. $StringLast .= "...";
48. }
49. return $StringLast;
50. }
51. }
52. $String = "bbs.it-home.org 脚本学堂 专心为您;
53. $Length = "18";
54. $Append = false;
55. echo sysSubStr($String,$Length,$Append);
56. ?>