PHP取得中文字符串的首字母

1. $limit = array( //gb2312 拼音排序
2. array(45217,45252), //A
3. array(45253,45760), //B
4. array(45761,46317), //C
5. array(46318,46825), //D
6. array(46826,47009), //E
7. array(47010,47296), //F
8. array(47297,47613), //G
9. array(47614,48118), //H
10. array(0,0), //I
11. array(48119,49061), //J
12. array(49062,49323), //K
13. array(49324,49895), //L
14. array(49896,50370), //M
15. array(50371,50613), //N
16. array(50614,50621), //O
17. array(50622,50905), //P
18. array(50906,51386), //Q
19. array(51387,51445), //R
20. array(51446,52217), //S
21. array(52218,52697), //T
22. array(0,0), //U
23. array(0,0), //V
24. array(52698,52979), //W
25. array(52980,53688), //X
26. array(53689,54480), //Y
27. array(54481,55289), //Z
28. );
30. $str="A:这是一个测试程序1";
31. $str= iconv("UTF-8","gb2312", $str);
32. echo $str."";
33. $i=0;
34. while($i $tmp=bin2hex(substr($str,$i,1));
35. if($tmp>='B0'){ //汉字的开始
36. $t=getLetter(hexdec(bin2hex(substr($str,$i,2))));
37. printf("%c",$t==-1 ? '*' : $t );
38. $i+=2;
39. }
40. else{
41. printf("%s",substr($str,$i,1));
42. $i++;
43. }
44. }
46. function getLetter($num){
47. global $limit;
48. $char_index=65;
49. foreach($limit as $k=>$v){
50. if($num>=$v[0] && $num $char_index+=$k;
51. return $char_index;
52. }
53. }
54. return -1;
55. }
56. ?>

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首字母, PHP