tp5.1 php 记录集foreach for循环array_merge函数合拼、array_column函数组装成一维数组array[1,2,45]php数组合并 要保持两个数组的键名都不变

结果1：array[1,2,45]

一、循环记录方法

代码：

        $rs = Db::name('register')
        ->alias('r')
        ->field('r.id,r.user_id')
        ->join('register_class c','r.class_id = c.id')//模块
        ->where('r.deleted',0)
        ->where('c.deleted',0)
        ->select();
        if(count($rs)>0){
          $useridarr = [];
          foreach($rs as $key => $v){
            $useridarr[]=$v['user_id'];
          }
        }

$useridarr[]=$v['user_id'];

结果2：array[{id:1,titl:标题1},{id:2,titl:标题2}]

foreach($cidarr as $cid){
    $rs4=Db::name('xx')->field('id,title')->where('deleted',0)->select();
    if(count($rs4)>0){
            foreach($rs4 as $k=> $v4){
                $uidarr[] = $v4['id'];
                                                
                $arr['id'] = $v4['id'];
                $arr['title'] = $v4['title'];
                $uidtitlearr[] = $arr;
            }
    }
}

$uidarr输出：array[1,2,45]

$uidtitlearr输出：array[{id:1,titl:标题1},{id:2,titl:标题2}]

二、php内置函数实现

        $rs = Db::name('register')
        ->alias('r')
        ->field('r.id,r.user_id')
        ->join('register_class c','r.class_id = c.id')//模块
        ->where('r.deleted',0)
        ->where('c.deleted',0)
        ->select();
        if(count($rs)>0){
//              foreach($rs as $key => $v1){
//                $useridarr[]=$v1['user_id'];
//              }
          $useridarr = array_column($rs,'user_id');
        }

$useridarr = array_column($rs,'user_id');

array_column($rs,'user_id')：从记录中取得user_id的值组成数组

其它例子：

$useridarr = []; 在开始前一定要设置这个

      if(count($cidarr)){
        $useridarr = [];
        foreach($cidarr as $k => $cid){
          //dump($cid);
            $rs = Db::name('register')
            ->alias('r')
            ->field('r.id,r.user_id')
            ->join('register_class c','r.class_id = c.id')//模块
            ->where('r.class_id',$cid)
            ->where('r.deleted',0)
            ->where('r.state_copy',0)
            ->where('c.deleted',0)
            ->select();
            if(count($rs)>0){
//              foreach($rs as $key => $v1){
//                $useridarr[]=$v1['user_id'];
//              }
              $useridarr = array_merge($useridarr,array_column($rs,'user_id'));
            }
            //dump($useridarr);
        }
        //dump($useridarr);
        $useridarr = array_values(array_unique($useridarr));
        
      }

$useridarr = array_merge($useridarr,array_column($rs,'user_id'));  

array_column($rs,'user_id')：从记录中取得user_id的值组成数组

array_merge($useridarr,array_column($rs,'user_id'))：合拼数组($useridarr)

php数组合并 要保持两个数组的键名都不变

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