在php中有一款字符串截取函数substr但这款函数,只能截取英文不支持中文与其它的混体,下面我们提供了三款函数,它们可以支持中英文混合体,实例代码如下:

1. function syssubstr($string,$length,$append = false)
2. {
3. if (strlen($string) < = $length )
4. {
5. return $string;
6. }
7. else
8. {
9. $i = 0;
10. while ($i < $length)
11. {
12. $stringtmp = substr($string,$i,1);
13. if ( ord($stringtmp) >=224 )
14. {
15. $stringtmp = substr($string,$i,3);
16. $i = $i + 3;
17. }
18. elseif( ord($stringtmp) >=192 )
19. {
20. $stringtmp = substr($string,$i,2);
21. $i = $i + 2;
22. }
23. else
24. {
25. $i = $i + 1;
26. }
27. $stringlast[] = $stringtmp;
28. }
29. $stringlast = implode("",$stringlast);
30. if($append)
31. {
32. $stringlast .= "...";
33. }
34. return $stringlast;
35. }
36. }
37. $string = "";
38. $length = "18";
39. $append = false;
40. echo syssubstr($string,$length,$append);

字符串截取函数二,实例代码如下:

1. function cut_str($string,$sublen,$start=0,$code='utf-8')
2. {
3. if($code=='utf-8')
4. {
5. $pa="/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef]
6. [x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf]
7. [x80-xbf][x80-xbf]/";
8. preg_match_all($pa,$string,$t_string);
9. if(count($t_string[0])-$start>$sublen) return join('',array_slice
10. ($t_string[0],$start,$sublen))."...";
11. return join('',array_slice($t_string[0],$start,$sublen));
12. }
13. else
14. {
15. $start=$start*2;
16. $sublen=$sublen*2;
17. $strlen=strlen($string);
18. $tmpstr='';
19. for($i=0;$i<$strlen;$i++)
20. {
21. if($i>=$start&&$i<($start+$sublen))
22. {
23. if(ord(substr($string,$i,1))>129)
24. {
25. $tmpstr.=substr($string,$i,2);
26. }
27. else
28. {
29. $tmpstr.=substr($string,$i,1);
30. }
31. }
32. if(ord(substr($string,$i,1))>129) $i++;
33. }
34. if(strlen($tmpstr)<$strlen ) $tmpstr.="...";
35. return $tmpstr;
36. }
37. }
38. $str="新程php培训";
39. echo cut_str($str,8,0,'gb2312');

函数三,实例代码如下:

1. <?php
2. //截取utf8字符串
3. function utf8substr($str, $from, $len)
4. {
5. return preg_replace('#^(?:[x00-x7f]|[xc0-xff][x80-xbf]+)
6. {0,'.$from.'}'.
7. '((?:[x00-x7f]|[xc0-xff][x80-xbf]+){0,'.$len.'}).*#s',
8. '$1',$str); //开源软件:phpfensi.com
9. }
10. ?>

上面三款函数都很好对中文字符等进行截取了,好了不说多了这些都是来自于网络.