Flight::chunk(200, function ($flights) {
 foreach ($flights as $flight) {
  //
 }
});

$all_ark=Arkvolume::chunk(50000, function ($flights) {
 foreach ($flights as $flight) {
  $GLOBALS['something'][] = $flight['id'];
 }
});
 
var_dump($GLOBALS['something'] );exit;

User::where('approved', 0)->chunk(100, function ($users) {
 foreach ($users as $user) {
 $user->update(['approved' => 1]);
 }
});

public function chunk($count, callable $callback)
{
 $results = $this->forPage($page = 1, $count)->get();
 
 while (count($results) > 0) {
  // On each chunk result set, we will pass them to the callback and then let the
  // developer take care of everything within the callback, which allows us to
  // keep the memory low for spinning through large result sets for working.
  if (call_user_func($callback, $results) === false) {
   return false;
  }
 
  $page++;
 
  $results = $this->forPage($page, $count)->get();
 }
 
 return true;
}

User::where('approved', 0)->chunk(100, function ($users) {
 foreach ($users as $user) {
 $user->update(['approved' => 1]);
 }
});

select * from users where approved = 0 limit 100 offset 0;

select * from users where approved = 0 limit 100 offset 100;