获取多个汉字首字母(php)

 <?php
 function getfirstchar($s0){
     $fchar = ord($s0{0});
     if($fchar >= ord("A") and $fchar <= ord("z") )return strtoupper($s0{0});
     $s1 = iconv("UTF-8","gb2312", $s0);
     $s2 = iconv("gb2312","UTF-8", $s1);
     if($s2 == $s0){$s = $s1;}else{$s = $s0;}
     $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
     if($asc >= -20319 and $asc <= -20284) return "A";
     if($asc >= -20283 and $asc <= -19776) return "B";
     if($asc >= -19775 and $asc <= -19219) return "C";
     if($asc >= -19218 and $asc <= -18711) return "D";
     if($asc >= -18710 and $asc <= -18527) return "E";
     if($asc >= -18526 and $asc <= -18240) return "F";
     if($asc >= -18239 and $asc <= -17923) return "G";
     if($asc >= -17922 and $asc <= -17418) return "I";
     if($asc >= -17417 and $asc <= -16475) return "J";
     if($asc >= -16474 and $asc <= -16213) return "K";
     if($asc >= -16212 and $asc <= -15641) return "L";
     if($asc >= -15640 and $asc <= -15166) return "M";
     if($asc >= -15165 and $asc <= -14923) return "N";
     if($asc >= -14922 and $asc <= -14915) return "O";
     if($asc >= -14914 and $asc <= -14631) return "P";
     if($asc >= -14630 and $asc <= -14150) return "Q";
     if($asc >= -14149 and $asc <= -14091) return "R";
     if($asc >= -14090 and $asc <= -13319) return "S";
     if($asc >= -13318 and $asc <= -12839) return "T";
     if($asc >= -12838 and $asc <= -12557) return "W";
     if($asc >= -12556 and $asc <= -11848) return "X";
     if($asc >= -11847 and $asc <= -11056) return "Y";
     if($asc >= -11055 and $asc <= -10247) return "Z";
     return null;
 }

 function pinyin1($zh){
     $ret = "";
     $s1 = iconv("UTF-8","gb2312", $zh);
     $s2 = iconv("gb2312","UTF-8", $s1);
     if($s2 == $zh){$zh = $s1;}
     for($i = 0; $i < strlen($zh); $i++){
         $s1 = substr($zh,$i,1);
         $p = ord($s1);
         if($p > 160){
             $s2 = substr($zh,$i++,2);
             $ret .= getfirstchar($s2);
         }else{
             $ret .= $s1;
         }
     }
     return $ret;
 }
 echo "北京信息学校<br/>";
 echo pinyin1('北京信息学校');

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