php中截取中文字符串

1. 截取GB2312中文字符串

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

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

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3. UTF-8、GB2312都支持的汉字截取函数

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

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4. BugFree 的字符截取函数

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

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