思路：
1.先获取字符串第一个字符串并转化成ASCII 值然后再转换成: A B C...Z
2.然后将数组中的所有值通过 A-Z进行归类例如:A=>数组,B=>数组
3.在进行数组按照键名进行升序或者降序排列 ksort或者asort（升序）
具体代码如下：
/** 提取字符串首字母*/function _getFirstCharter($str){if(empty($str)){return '';}$fchar=ord($str{0});if($fchar>=ord('A')&&$fchar<=ord('z')) return strtoupper($str{0});try{$s1=iconv('UTF-8','gb2312',$str);$s2=iconv('gb2312','UTF-8',$s1);}catch (\Exception $e){$s1=iconv('UTF-8','GBK',$str);$s2=iconv('GBK','UTF-8',$s1);}// $s1=iconv('UTF-8','gb2312',$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;}
/** $contact 一个数组*/function doing(){$list=[];//给每个数组添加字段 chart 值为所属的A-Z的字母分类foreach($contact as &$v){$v['chart']=$this->_getFirstCharter($v['real_name']);}$data=[];//给所有数组进行A-Z分类foreach ($contact as $val) {if ( empty( $data[ $val['chart'] ] ) ) {$data[$val['chart']]=[];}$data[$val['chart']][]=$val;}//按照键名排序ksort($data);$list=[];foreach($data as $k=>$vv){foreach($vv as $item){array_push($list,$item);}}return json($this->render(200,'成功',$list));}
