感谢sadly为我们写出了在GD中输出汉字的函数,我在使用中发现此版本输出的字符串必须为纯中文,不能夹杂英文,随修改了此bug，与大家分享。

1. <?
2. //Program writen by sadly www.phpfensi.com
3. //modified by agun 2013/6/20
4. function gb2utf8($gb)
5. {
6. if(!trim($gb))
7. return $gb;
8. $filename="gb2312.txt";
9. $tmp=file($filename);
10. $codetable=array();
11. while(list($key,$value)=each($tmp))
12. $codetable[hexdec(substr($value,0,6))]=substr($value,7,6);
13. $ret="";
14. $utf8="";
15. while($gb)
16. {
17. if (ord(substr($gb,0,1))>127)
18. {
19. $this=substr($gb,0,2);
20. $gb=substr($gb,2,strlen($gb));
21. $utf8=u2utf8(hexdec($codetable[hexdec(bin2hex($this))-0x8080]));
22. for($i=0;$i<strlen($utf8);$i+=3)
23. $ret.=chr(substr($utf8,$i,3));
24. }
25. else
26. {
27. $ret.=substr($gb,0,1);
28. $gb=substr($gb,1,strlen($gb));
29. }
30. }
31. return $ret;
32. }
33. function u2utf8($c)
34. {
35. for($i=0;$i<count($c);$i++)
36. $str="";
37. if ($c < 0x80) {
38. $str.=$c;
39. }
40. else if ($c < 0x800) {
41. $str.=(0xC0 | $c>>6);
42. $str.=(0x80 | $c & 0x3F);
43. }
44. else if ($c < 0x10000) {
45. $str.=(0xE0 | $c>>12);
46. $str.=(0x80 | $c>>6 & 0x3F);
47. $str.=(0x80 | $c & 0x3F);
48. }
49. else if ($c < 0x200000) {
50. $str.=(0xF0 | $c>>18);
51. $str.=(0x80 | $c>>12 & 0x3F);
52. $str.=(0x80 | $c>>6 & 0x3F);
53. $str.=(0x80 | $c & 0x3F);
54. }
55. return $str;
56. }
57. Header("Content-type: image/gif");
58. $im = imagecreate(300,150);
59. $bkg = ImageColorAllocate($im, 0,0,0);
60. $clr = ImageColorAllocate($im, 255,255,255);
61. $fnt = "c:windowsfontssimsun.ttf";
62. //include("gb2utf8.php");
63. $str = gb2utf8("中国agun阿棍");
64. ImageTTFText($im, 30, 0, 50,50, $clr, $fnt, $str);
65. ImageGif($im);
66. ImageDestroy($im);
67. ?>