Menggunakan hasil kueri ke kueri lain dengan IN()

Gunakan larik:

$ids = array(); 
foreach($result as $key=>$value){
 $ids[] = $value['id'];}

if (count($ids) > 0)   // to avoid mySQL error on empty array
 {
   $ids_string = implode(",", $ids);
   $sql2 = 'SELECT * FROM table where id IN($ids_string)'; 
 }