PHP生成字母前缀

[PHP]代码

function ff_letter_first($s0){
    $firstchar_ord=ord(strtoupper($s0{0}));
    if (($firstchar_ord>=65 and $firstchar_ord=48 and $firstchar_ord    $s=iconv("UTF-8","gb2312", $s0);
    $asc=ord($s{0})*256+ord($s小贝)-65536;
    if($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 0;//null
}

PHP