一个关于排队的问题

需求

一个拓展训练班，教练带队，要把成员按照性别随机分成5组，最好保证男女比例尽量平均。

程序流程

教练在后台添加一个队伍，id为1；指定队伍有5个分组，groups=5。
学员来到报名页，选择该教练的的队伍，提交数据到程序。

表结构

存储队伍成员的表

代码

$userinfo = ['team_id'=>1,'sex'=>1,'uid'=>1,'groups'=>5];
add_user($userinfo);
function add_user($userinfo){
		$user_list  = Db::name('team_user')->where(['team_id'=>$userinfo['team_id']])->select();
		//如果队伍人数小于队伍的分组数，直接把用户信息插入到下一个分组中
		if(empty($user_list) || count($user_list)<$userinfo['groups']){
			if(empty($user_list)){
				$team_num = 1;
			}else{
				$team_num = count($user_list)+1;
			}
			$data = [
					'uid'	=> $userinfo['uid'],
					'team_num' => $team_num,
					'sex'	=> $userinfo['sex'],
					'team_id' => $userinfo['team_id'],
				];
			Db::name('team_user')->insert($data);
			return true;
		}else{
			//如果队伍人数已经大于队伍分组数
			//把队员按小组号分组，然后把分组按照人数顺序排列。遍历5个小组，判断小组是否缺少当前用户，需要，插入，结束循环

			//分组
			$team_arr = [];
			foreach($user_list as $v){
				if(!isset($team_arr[$v['team_num']])){
					$team_arr[$v['team_num']] = [
						'user_num' => 1,
						'boys'  => $v['sex']==1?1:0,
						'girls'	=> $v['sex']==2?1:0
					];
				}else{
					$team_arr[$v['team_num']]['user_num'] += 1;
					if($v['sex'] == 1){
						$team_arr[$v['team_num']]['boys'] += 1;
					}elseif($v['sex'] == 2){
						$team_arr[$v['team_num']]['girls'] += 1;
					}
				}
				$team_arr[$v['team_num']]['team_num'] = $v['team_num'];
			}
		}
		//判断各个小组需要男生还是女生
		foreach($team_arr as $k=>$v){
			//男生人数大于女生人数，需要女生
			if($v['boys'] > $v['girls']){
				$need_sex = 2;
				$need = 1;
			//男生人数小于女生人数，需要男生
			}elseif($v['girls'] > $v['boys']){
				$need_sex = 1;
				$need = 1;
			}else{
				$need_sex = 0;
				$need = 0;
			}
			$team_arr[$k]['need_sex'] = $need_sex;
			$team_arr[$k]['need'] = $need;
		}
		//按人数 顺序排序
		//人数若相等，再按是否需要新成员 排序，不需要新成员的小组排在下面
		$user_num_sort = array_column($team_arr,'user_num');
		$need_sort = array_column($team_arr,'need');
		array_multisort($user_num_sort,SORT_ASC,$need_sort,SORT_DESC,$team_arr);
		print_r($team_arr);exit;
		//插入用户
		$data = [
					'uid'	=> $userinfo['uid'],
					'sex'	=> $userinfo['sex'],
					'team_id' =>  $userinfo['team_id'],
				];
		foreach($team_arr as $v){
			if($userinfo['sex'] == $v['need_sex']){
				$data['team_num'] = $v['team_num'];
				Db::name('team_user')->insert($data);
				return true;
			}
		}
		//运行到这一步，说明该用户的性别，所有小组都不需要，那插入到排在第一位（即人数最少）的小组
		$data['team_num'] = $team_arr[0]['team_num'];
		Db::name('team_user')->insert($data);
	}