PHP实现汉字或英文按照首字母查找

/** 
    * 
    */ 
function getfirstchar($s0){  
               if($s0[0]=='I' || $s[0]=='i'){  
                   return "I";  
               }elseif($s0[0]=='U' || $s[0]=='u'){  
                   return 'U';  
               }elseif($s0[0]=='V' || $s[0]=='v'){  
                   return 'V';  
               }else{  
    $fchar = ord($s0{0});  
    if($fchar >= ord("A") and $fchar = -20319 and $asc = -20283 and $asc = -19775 and $asc = -19218 and $asc = -18710 and $asc = -18526 and $asc = -18239 and $asc = -17922 and $asc = -17417 and $asc = -16474 and $asc = -16212 and $asc = -15640 and $asc = -15165 and $asc = -14922 and $asc = -14914 and $asc = -14630 and $asc = -14149 and $asc = -14090 and $asc = -13318 and $asc = -12838 and $asc = -12556 and $asc = -11847 and $asc = -11055 and $asc