php汉字转码 Unicode(UTF8)至GBK编码转换

2. //php汉字转码
3. class qswhU{
4. var $qswhData;
5. function qswhU($filename="qswhU.php"){
6. $this->qswhData=file($filename);
7. }
9. function decode($str,$pattern=0){
10. $arr=array("/(/w+);/iU","/((%/w/w)+)/i","/%u(/w{4,5})/iU");
11. if(is_integer($pattern)){
12. if($pattern>=count($arr))die("Invalid Function");
13. $pattern=$arr[$pattern];
14. }
15. return preg_replace_callback($pattern,array($this,"u2gb"),$str);
16. } // 程序员之家 bbs.it-home.org
17. function u2gb($arr){
18. /******(qiushuiwuhen 2002-8-15)******/
19. $ret="";$str=$arr[1];
20. if(preg_match_all("/%/w{2}/",$str,$matches)){
21. for($i=0;$i $chr1=hexdec(substr($matches[0][$i],1));
22. $arr=array("f0","e0","c0","0");
23. for($j=0;$jhexdec($arr[$j]))break;
24. $chr=hexdec(substr($matches[0][$i],1))-hexdec($arr[$j]);
25. while(++$j $str=dechex($chr);
26. if(strlen($str)==4){
27. $p=hexdec(substr($str,0,2))-0x4d;
28. $q=hexdec(substr($str,2))*4;
29. $ret.=chr(hexdec(substr($this->qswhData[$p],$q,2)));
30. $ret.=chr(hexdec(substr($this->qswhData[$p],$q+2,2)));
31. }else
32. $ret.=chr(hexdec($str));
33. }
34. }
35. else{
36. if(strtolower($str[0])=="x")
37. $str=substr($str,1);
38. else
39. if(strlen($str)!=4)$str=dechex($str);
41. if(strlen($str)==4){
42. $p=hexdec(substr($str,0,2))-0x4d;
43. $q=hexdec(substr($str,2))*4;
44. $ret.=chr(hexdec(substr($this->qswhData[$p],$q,2)));
45. $ret.=chr(hexdec(substr($this->qswhData[$p],$q+2,2)));
46. }else
47. $ret.=chr(hexdec($str));
48. }
49. return $ret;
50. }
51. }

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使用实例：

2. $qswh=new qswhU("qswhU.php");//如果文件名是qswhU.php,可省参数
3. echo "不带参数(默认过滤为：[num];):";
4. echo "/n".$qswh->decode("中文Abc");
5. echo "/n".$qswh->decode("中文Abc");
6. echo "/n调用内置过滤(UTF转码):".$qswh->decode("%E4%B8%AD%E6%96%87%20!%22%23%24%25%26'()*%2B%2C%2F%3A%3B%3C%3D%3E%3F%40%5B%5D%5E%60%7B%7C%7D~%25Abc",1);
7. echo "/n调用内置过滤unescape(%u[num]):".$qswh->decode("%u4E2D%u6587Abc",2);
8. echo "/n自定义过滤([x+num]):".$qswh->decode("[x4E2D][x6587][x41][x62][x63]","//[(/w+)/]/");

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效果如下： 不带参数(默认过滤为：[num];): 中文Abc 中文Abc 调用内置过滤(UTF转码):中文 !"#$%&'()*+,/:;?@[]^`{|}~%Abc 调用内置过滤unescape(%u[num]):中文Abc 自定义过滤([x+num]):中文Abc