php - Fetch all related parent and child ids by given ID -


i have table 'table' following structure

   id   linkedwith     12     13     13     12     14     13     15     14     16      0     17      0     18     21

we given id "12" (or may 15), have fetch other related ids.

here 12 linked 13, 14 linked 13, , 15 linked 14 , on. in our case, there 4 ids indirectly related, there many. example, in above case need final result of ids 12,13,14,15.

i have got incomplete function, couldn't think of further. know might need recursive function not sure how that

function testfetchrelated($id){         $arrayids = array($id);           try{             $dbh = new pdoconfig("db_test");             $stmt = $dbh->prepare("select * table id='".$id."' or linkedwith='".$id."'");             $stmt->execute();              if($stmt->rowcount()>0){                 $fetch = $stmt->fetchall(pdo::fetch_obj);                  foreach($fetch $f){                     if($f->linkedwith>0){                         array_push($arrayids, $f->linkedwith);                     }                      if($f->id!=$id){                         array_push($arrayids, $f->id);                     }                 }             }else{              }              $stmt = null;             $dbh = null;              return $arrayids;         }catch(pdoexception $e){             echo "an error occurred: ".$e->getmessage();         }

can me on this

i have knocked seem want in mysql procedure:-

delimiter ;;  drop procedure if exists `find_relations`;; create procedure `find_relations`(in_id int) begin      create table ids_tmp      (         id  int(11),         primary key (id)     );      insert ids_tmp     select a.id some_table a.linkedwith = in_id     union      select a.linkedwith some_table a.id = in_id     union      select a.linkedwith some_table a.linkedwith = in_id     union      select a.id some_table a.id = in_id;      while (row_count() > 0)         insert ids_tmp         select a.id some_table          inner join ids_tmp b on a.linkedwith = b.id          left outer join ids_tmp c on a.id = c.id          c.id null         union          select a.id some_table          inner join ids_tmp b on a.id = b.id          left outer join ids_tmp c on a.linkedwith = c.id          c.id null;     end while;      select id ids_tmp;      drop table if exists ids_tmp;  end;;  delimiter ;

you can invoke using call find_relations(12);

not full debugged (it better use temporary table, relies on accessing same table multiple times in various single queries, mysql doesn't support temp tables), give ideas.

if want use need ensure created table has name unique session.


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