【PHP】数组按照字母排序

    /**
     * 将数组按字母A-Z排序
     * @return [type] [description]
     */
    private function chartSort($list)
    {
//        $user=$this->user;
        $data = [];
        foreach ($list as $k => $v) {
            $v[‘letter‘] = $this->getFirstChart($v[‘name‘]);
            if (empty($data[$v[‘letter‘]])) {
                $data[$v[‘letter‘]] = [];
            }
            $data[$v[‘letter‘]][] = $v;
        }

        $i = 0;
        foreach ($data as $k => $v) {
            $li[$i][‘letter‘] = $k;
            $li[$i][‘list‘] = $v;
            $i++;
        }
        sort($li);
        return $li;
    }
    /**
     * 返回取汉字的第一个字的首字母
     * @param  [type] $str [string]
     * @return [type]      [strind]
     */
    private function getFirstChart($str){
        if( empty($str) ){
            return ‘‘;
        }
        $char=ord($str[0]);
        if( $char >= ord(‘A‘) && $char <= ord(‘z‘) ){
            return strtoupper($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;
    }