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四个php中文字符串截取函数

时间:2021-07-01 10:21:17 帮助过:12人阅读

  1. //截取中文字符串
  2. function mysubstr($str, $start, $len) {
  3. $tmpstr = "";
  4. $strlen = $start + $len;
  5. for($i = 0; $i < $strlen; $i++) {
  6. if(ord(substr($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. ?>

2、截取utf8编码的多字节字符串

  1. < ?php
  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. ?>

3、UTF-8、GB2312都支持的汉字截取函数

  1. < ?php
  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< $strlen; $i++)
  25. {
  26. if($i>=$start && $i< ($start+$sublen))
  27. {
  28. if(ord(substr($string, $i, 1))>129)
  29. {
  30. $tmpstr.= substr($string, $i, 2);
  31. }
  32. else
  33. {
  34. $tmpstr.= substr($string, $i, 1);
  35. }
  36. }
  37. if(ord(substr($string, $i, 1))>129) $i++;
  38. }
  39. if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
  40. return $tmpstr;
  41. }
  42. }
  43. $str = "abcd需要截取的字符串";
  44. echo cut_str($str, 8, 0, 'gb2312');
  45. ?>

4、BugFree 字符截取函数

  1. < ?php
  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) < = $Length )
  18. {
  19. return $String;
  20. }
  21. else
  22. {
  23. $I = 0;
  24. while ($I < $Length)
  25. {
  26. $StringTMP = substr($String,$I,1);
  27. if ( ord($StringTMP) >=224 )
  28. {
  29. $StringTMP = substr($String,$I,3);
  30. $I = $I + 3;
  31. }
  32. elseif( ord($StringTMP) >=192 )
  33. {
  34. $StringTMP = substr($String,$I,2);
  35. $I = $I + 2;
  36. }
  37. else
  38. {
  39. $I = $I + 1;
  40. }
  41. $StringLast[] = $StringTMP;
  42. }
  43. $StringLast = implode("",$StringLast);
  44. if($Append)
  45. {
  46. $StringLast .= "...";
  47. }
  48. return $StringLast;
  49. }
  50. }
  51. $String = "bbs.it-home.org 脚本学堂 专心为您;
  52. $Length = "18";
  53. $Append = false;
  54. echo sysSubStr($String,$Length,$Append);
  55. ?>

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