PHP实现获取第一个中文首字母并进行排序的方法

Array
(
  [0] => Array
    (
      [sid] => 2885842
      [recetcstoredpay] => 24000
      [recetclprinciple] => 23465
      [paytcstoredpay] => 5455
      [paytclprinciple] => 34900
      [sname] => 百宴餐饮---便宜坊烤鸭店
    )
  [1] => Array
    (
      [sid] => 3644191
      [recetcstoredpay] => 89200
      [recetclprinciple] => 406930
      [paytcstoredpay] => 4090
      [paytclprinciple] => 97800
      [sname] => 大长秋餐饮中心
    )
  [2] => Array
    (
      [sid] => 5229673
      [recetcstoredpay] => 26000
      [recetclprinciple] => 45930
      [paytcstoredpay] => 24795
      [paytclprinciple] => 121800
      [sname] => 大众点评网
    )
  [3] => Array
    (
      [sid] => 3715927
      [recetcstoredpay] => 13600
      [recetclprinciple] => 56930
      [paytcstoredpay] => 5710
      [paytclprinciple] => 37800
      [sname] => 江东北路店
    )
  [4] => Array
    (
      [sid] => 3671092
      [recetcstoredpay] => 1280
      [recetclprinciple] => 46930
      [paytcstoredpay] => 128090
      [paytclprinciple] => 149800
      [sname] => 金凤区新馆
    )
  [5] => Array
    (
      [sid] => 1858783
      [recetcstoredpay] => 2040
      [recetclprinciple] => 4465
      [paytcstoredpay] => 245
      [paytclprinciple] => 4900
      [sname] => 浙江西子宾馆
    )
  [6] => Array
    (
      [sid] => 16832117
      [recetcstoredpay] => 81600
      [recetclprinciple] => 470930
      [paytcstoredpay] => 506090
      [paytclprinciple] => 8000
      [sname] => 欢乐谷店
    )
)

/
 取汉字的第一个字的首字母
 @param type $str
 @return string|null
/
public function _getFirstCharter($str){
if(emptyempty($str)){return '';}
$fchar=ord($str{0});
if($fchar>=ord('A')&&$fchar<=ord('z')) return strtoupper($str{0});
$s1=iconv('UTF-8','gb2312',$str);
$s2=iconv('gb2312','UTF-8',$s1);
$s=$s2==$str?$s1:$str;
$asc=ord($s{0})256+ord($s{1})-65536;
if($asc>=-20319&&$asc<=-20284) return 'A';
if($asc>=-20283&&$asc<=-19776) return 'B';
if($asc>=-19775&&$asc<=-19219) return 'C';
if($asc>=-19218&&$asc<=-18711) return 'D';
if($asc>=-18710&&$asc<=-18527) return 'E';
if($asc>=-18526&&$asc<=-18240) return 'F';
if($asc>=-18239&&$asc<=-17923) return 'G';
if($asc>=-17922&&$asc<=-17418) return 'H';
if($asc>=-17417&&$asc<=-16475) return 'J';
if($asc>=-16474&&$asc<=-16213) return 'K';
if($asc>=-16212&&$asc<=-15641) return 'L';
if($asc>=-15640&&$asc<=-15166) return 'M';
if($asc>=-15165&&$asc<=-14923) return 'N';
if($asc>=-14922&&$asc<=-14915) return 'O';
if($asc>=-14914&&$asc<=-14631) return 'P';
if($asc>=-14630&&$asc<=-14150) return 'Q';
if($asc>=-14149&&$asc<=-14091) return 'R';
if($asc>=-14090&&$asc<=-13319) return 'S';
if($asc>=-13318&&$asc<=-12839) return 'T';
if($asc>=-12838&&$asc<=-12557) return 'W';
if($asc>=-12556&&$asc<=-11848) return 'X';
if($asc>=-11847&&$asc<=-11056) return 'Y';
if($asc>=-11055&&$asc<=-10247) return 'Z';
return null;
}

//门店名称
$shopData = $this->_shopNamesArray;
//根据门店名称第一个汉字的首字母正序排序
$settles = $result['data'];
$settlesRes = array();
foreach ($settles as $sett) {
    $sname = $shopData[$sett['sid']];
    $sett['sname'] = $sname;
    $snameFirstChar = $this->_getFirstCharter($sname); //取出门店的第一个汉字的首字母
    $settlesRes[$snameFirstChar] = $sett;//以这个首字母作为key
}
ksort($settlesRes); //对数据进行ksort排序，以key的值升序排序

Array
(
  [B] => Array
    (
      [sid] => 2885842
      [recetcstoredpay] => 24000
      [recetclprinciple] => 23465
      [paytcstoredpay] => 5455
      [paytclprinciple] => 34900
      [sname] => 百宴餐饮---便宜坊烤鸭店
    )
  [D] => Array
    (
      [sid] => 5229673
      [recetcstoredpay] => 26000
      [recetclprinciple] => 45930
      [paytcstoredpay] => 24795
      [paytclprinciple] => 121800
      [sname] => 大众点评网
    )
  [H] => Array
    (
      [sid] => 16832117
      [recetcstoredpay] => 81600
      [recetclprinciple] => 470930
      [paytcstoredpay] => 506090
      [paytclprinciple] => 8000
      [sname] => 欢乐谷店
    )
  [J] => Array
    (
      [sid] => 3671092
      [recetcstoredpay] => 1280
      [recetclprinciple] => 46930
      [paytcstoredpay] => 128090
      [paytclprinciple] => 149800
      [sname] => 金凤区新馆
    )
  [Z] => Array
    (
      [sid] => 1858783
      [recetcstoredpay] => 2040
      [recetclprinciple] => 4465
      [paytcstoredpay] => 245
      [paytclprinciple] => 4900
      [sname] => 浙江西子宾馆
    )
)