php不使用iconv库进行gb2312与utf-8编码转换的函数

3. //对照表的使用

4. $filename = "gb2utf8.txt";
5. $fp = fopen($filename,"r");
6. while(! feof($fp)) {
7. list($gb,$utf8) = fgetcsv($fp,10);
8. $charset[$gb] = $utf8;
9. }
10. fclose($fp);
11. //以上读取对照表到数组备用

12. /** gb2312到utf-8 **/

13. function gb2utf8($text, &$charset) {
14. //提取文本中的成分，汉字为一个元素，连续的非汉字为一个元素
15. preg_match_all("/(?:[\x80-\xff].)|[\x01-\x7f]+/",$text,$tmp);
16. $tmp = $tmp[0];
17. //分离出汉字
18. $ar = array_intersect($tmp, array_keys($charset));
19. //替换汉字编码
20. foreach($ar as $k=>$v)
21. $tmp[$k] = $charset[$v];
22. //返回换码后的串
23. return join('',$tmp);
24. }

25. /** utf-8到gb2312 **/

26. function utf82gb($text, &$charset) {
27. $p = "/[xf0-xf7][x80-xbf]{3}|[xe0-xef][x80-xbf]{2}|[xc2-xdf][x80-xbf]|[x01-x7f]+/";
28. preg_match_all($p,$text,$r);
29. $utf8 = array_flip($charset);
30. foreach($r[0] as $k=>$v)
31. if(isset($utf8[$v]))
32. $r[0][$k] = $utf8[$v];
33. return join('',$r[0]);
34. }

35. //测试

36. $s = gb2utf8('这是对照表的测试', $charset);
37. echo utf82gb($s, $charset);
38. ?>

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