How can I use array from mysql in mongodb query?

I search mysql db and get the result into a php array ($ID).

 $ID=array();

 while($Rlist=mysql_fetch_array($query_result)){
            $ID[] = $Rlist['ids'];                  
 }

I like to use the array of IDs in a mongodb query.

 $list=$collection->find(array("id"=>array('$in'=>[$ID])), array("title" => 1, "detail" => 1, "logo" => 1  ))->limit(50);

As you may quess, I'm not succesfull. How can we solve this problem?

UPDATE: The problem here, php array format is:

$ID="1,2,3,4";

but mongodb needs a format like:

$ID='1','2','3','4';

UPDATE var_dump($ID);

array(20) { [0]=> string(3) "502" [1]=> string(4) "1643" [2]=> string(4) "3342" [3]=> string(4) "6948" [4]=> string(4) "8582" [5]=> string(4) "9420" [6]=> string(5) "10293" [7]=> string(5) "11014" [8]=> string(5) "12331" [9]=> string(5) "13874" [10]=> string(5) "19430" [11]=> string(5) "48789" [12]=> string(5) "67190" [13]=> string(6) "191315" [14]=> string(6) "293354" [15]=> string(6) "390314" [16]=> string(6) "500715" [17]=> string(6) "504151" [18]=> string(6) "742853" [19]=> string(6) "913465" }