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; $i if(ord(substr($str, $i, 1)) > 0xa0) {
7. $tmpstr .= substr($str, $i, 2);
8. $i++;
9. } else
10. $tmpstr .= substr($str, $i, 1);
11. }
12. return $tmpstr;
13. }
14. ?>

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2、截取utf8编码的多字节字符串

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

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3、UTF-8、GB2312都支持的汉字截取函数

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

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4、BugFree 字符截取函数

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

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