php中文截取字符串函数(很好用)

3. /**

4. * 中文字符串截取函数
5. * by bbs.it-home.org
6. */
7. function cut_str($string,$sublen,$filter=true,$start=0,$code='UTF-8'){
8. if($filter) $string=Html2Text($string);
9. if($code=='UTF-8'){
10. $pa="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
11. preg_match_all($pa,$string,$t_string);
12. if(count($t_string[0])-$start>$sublen) return join('',array_slice($t_string[0],$start,$sublen))."...";
13. return join('',array_slice($t_string[0],$start,$sublen));
14. }else{
15. $start=$start*2;
16. $sublen=$sublen*2;
17. $strlen=strlen($string);
18. $tmpstr='';
19. for($i=0;$i if($i>=$start&&$i if(ord(substr($string,$i,1))>129){
20. $tmpstr.=substr($string,$i,2);
21. }else{
22. $tmpstr.=substr($string,$i,1);
23. }
24. }
25. if(ord(substr($string,$i,1))>129) $i++;
26. }
27. if(strlen($tmpstr) return $tmpstr;
28. }
29. }

30. //html转换函数

31. function Html2Text($str){
32. $str = preg_replace("/||/isU","",$str);
33. $alltext = "";
34. $start = 1;
35. for($i=0;$i if($start==0 && $str[$i]==">"){
36. $start = 1;
37. }else if($start==1){
38. if($str[$i]==" $start = 0;
39. $alltext .= " ";
40. }else if(ord($str[$i])>31){
41. $alltext .= $str[$i];
42. }
43. }
44. }
45. $alltext = str_replace("　"," ",$alltext);
46. $alltext = preg_replace("/&([^;&]*)(;|&)/","",$alltext);
47. $alltext = preg_replace("/[ ]+/s"," ",$alltext);
48. return $alltext;
49. }

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