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四个php中文字符串截取函数

程序员文章站 2022-05-05 22:35:33
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  1. //截取中文字符串
  2. function mysubstr($str, $start, $len) {
  3. $tmpstr = "";
  4. $strlen = $start + $len;
  5. for($i = 0; $i if(ord(substr($str, $i, 1)) > 0xa0) {
  6. $tmpstr .= substr($str, $i, 2);
  7. $i++;
  8. } else
  9. $tmpstr .= substr($str, $i, 1);
  10. }
  11. return $tmpstr;
  12. }
  13. ?>
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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. @http://bbs.it-home.org
  7. */
  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, $t_string);
  14. if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
  15. return join('', array_slice($t_string[0], $start, $sublen));
  16. }
  17. else
  18. {
  19. $start = $start*2;
  20. $sublen = $sublen*2;
  21. $strlen = strlen($string);
  22. $tmpstr = '';
  23. for($i=0; $i{
  24. if($i>=$start && $i{
  25. if(ord(substr($string, $i, 1))>129)
  26. {
  27. $tmpstr.= substr($string, $i, 2);
  28. }
  29. else
  30. {
  31. $tmpstr.= substr($string, $i, 1);
  32. }
  33. }
  34. if(ord(substr($string, $i, 1))>129) $i++;
  35. }
  36. if(strlen($tmpstr)return $tmpstr;
  37. }
  38. }
  39. $str = "abcd需要截取的字符串";
  40. echo cut_str($str, 8, 0, 'gb2312');
  41. ?>
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4、BugFree 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. * @http://bbs.it-home.org
  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. }
  48. $String = "bbs.it-home.org 脚本学堂 专心为您;
  49. $Length = "18";
  50. $Append = false;
  51. echo sysSubStr($String,$Length,$Append);
  52. ?>
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