用于utf8编码的字符串截取的函数

3. /*

4. * 用于utf8编码的字符串截取
5. */
6. function utf8_substr($str,$position,$length){
7. $start_position = strlen($str);
8. $start_byte = 0;
9. $end_position = strlen($str);
10. $count = 0;
11. for($i = 0; $i if($count >= $position && $start_position > $i){
12. $start_position = $i;
13. $start_byte = $count;
14. }
15. if(($count-$start_byte)>=$length) {
16. $end_position = $i;
17. break;
18. }
19. $value = ord($str[$i]);
20. if($value > 127){
21. $count++;
22. if($value >= 192 && $value elseif($value >= 224 && $value elseif($value >= 240 && $value else die('Not a UTF-8 compatible string');
23. }
24. $count++;

25. }

26. return(substr($str,$start_position,$end_position-$start_position));
27. }
28. ?>

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