Phpmb_strlen () Chinese/English mixed character truncation code

If a fatalerror: calltoundefinedfunctionmb_strlen occurs when using mb_strlen, you can use phpinfo () to check whether mbstring is loaded. if not, try to copy php_mbstringdll to the windows directory.

If fatal error: call to undefined function mb_strlen occurs when using mb_strlen, you can use php info () to check whether mbstring is loaded. if not, try to copy php_mbstring.dll to the windows directory.

Utf-8 file encoding

1. $ Var = 'ABC ';
2. Mb_strlen ($ var, 'utf-8'); // output 7. both Chinese and English occupies one byte.
3. Mb_strlen ($ var); // output 15 Chinese characters in three bytes. English occupies one byte.
4. Mb_strlen ($ var, 'gbk'); // output 9 is abnormal

Retrieve all Chinese characters

1. Function utf8substr ($ str, $ from, $ len)
2. {
3. Return preg_replace ('# ^ (? : [X00-x7f] | [xc0-xff] [x80-xbf] +) {0, '. $ from .'}'.
4. '((? : [X00-x7f] | [xc0-xff] [x80-xbf] +) {0, '. $ len.'}). * # s ',
5. '$ 1', $ str );
6. }

Intercept code between Chinese and English

1. Function gb2312_strlen ($ string)
2. {
3. $ Str_len = strlen ($ string );
4. $ Str_count = 0;
5. For ($ j = 0; $ j <$ str_len; $ j ++)
6. {
7. If (ord ($ string {$ j}) <127)
8. {
9. $ Str_count + = 1;
10. Continue;
11. }
12. Else
13. {
14. If (ord ($ string {$ j + 1})> 127)
15. {
16. $ Str_count + = 1;
17. $ J ++;
18. Continue;
19. }
20. Else
21. {
22. $ Str_count + = 1;
23. Continue;
24. }
25. }
26. }
27. Return $ str_count;
28. }
29. $ Str = "enable s d ";
30. Echo gb2312_strlen ($ str );