Collection 笔记 
                                                    
                        
                    
                    
  
                    
                    where
collect($session)->where('is_valid',1)->count();
collect($temp)->where('phone','!=','')->count();
pluck
$temp = collect($session)->pluck('student'));
each
collect($temp)->each(function ($item){\
  if(true){
  }
  return false;
});
avg
collect($session)->pluck('avg_response_time')->avg() ?? 0 
reject
//抛弃23 返回[1,4,5]
collect([1,23,4,5])->reject(function($item){ return $item == 23;});
                        
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