PHP实现汉字或英文按照首字母查找

1. /**
2. *
3. */
4. function getfirstchar($s0){
5. if($s0[0]=='I' || $s[0]=='i'){
6. return "I";
7. }elseif($s0[0]=='U' || $s[0]=='u'){
8. return 'U';
9. }elseif($s0[0]=='V' || $s[0]=='v'){
10. return 'V';
11. }else{
12. $fchar = ord($s0{0});
13. if($fchar >= ord("A") and $fchar $s1 = iconv("UTF-8","gb2312", $s0);
14. $s2 = iconv("gb2312","UTF-8", $s1);
15. if($s2 == $s0){$s = $s1;}else{$s = $s0;}
16. $asc = ord($s{0}) * 256 + ord($s小贝) - 65536;
17. if($asc >= -20319 and $asc if($asc >= -20283 and $asc if($asc >= -19775 and $asc if($asc >= -19218 and $asc if($asc >= -18710 and $asc if($asc >= -18526 and $asc if($asc >= -18239 and $asc if($asc >= -17922 and $asc if($asc >= -17417 and $asc if($asc >= -16474 and $asc if($asc >= -16212 and $asc if($asc >= -15640 and $asc if($asc >= -15165 and $asc if($asc >= -14922 and $asc if($asc >= -14914 and $asc if($asc >= -14630 and $asc if($asc >= -14149 and $asc if($asc >= -14090 and $asc if($asc >= -13318 and $asc if($asc >= -12838 and $asc if($asc >= -12556 and $asc if($asc >= -11847 and $asc if($asc >= -11055 and $asc return null;
18. }
19. }

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首字母, PHP