Loop through an array to unset a known value and implode to sql

I have two set of arrays in different MYSQL table. This what I want to do

               What I Want TO Do
   TABLE_ONE            connect to the table.
                        get the value we want from session_id
                        THEN get the array associated with the value (session_id)
                        explode the array to get individual values.
                        NOW::::: - GO TO TABLE_TWO

   TABLE_TWO            Go straight to the first value from array (TABLE_ONE)
                        Explode the array associated with it.
                        Delete the number that's equal to the session_id
                开发者_JAVA百科       _____________________________________________________
                       And so fort....

More visual explanation below: session_id = 4

TABLE_ONE:

   id            array1
   1             4
   2             1
   3             2,5
   4             1,3,4,5
   5             4,5

TABLE_TWO:

   id            array2
   1             4,6,9,2
   2             3,7,8,2
   3             7,12,4,9
   4             1,5,4,8
   5             3,6,12,3,5,4

So, because session_id = 4, we go to TABLE_ONE id 4. The array of id-4 is 1,3,4,5. So now we know 4 can be found in id 1,3,4,5 of TABLE_TWO We should now explode TABLE_TWO's array and delete 4 from there array. Implode the array and save the new value to database.

THIS IS WHAT I HAVE DONE - it would delete only '4' from them id-3 and delete all the values in id-4. Please help!!

    $SESSION = 4;
    $depSQL = mysql_query("SELECT array1 FROM TABLE_ONE WHERE id='$SESSION' LIMIT 1"); 
while($row=mysql_fetch_array($depSQL)) { $depARRAY = $row["array1"]; }
$explodedDEP = explode(",", $depARRAY);
foreach ($explodedDEP as $key1 => $value1) {

    $stSQL = mysql_query("SELECT array2 FROM TABLE_TWO WHERE id='$value1'"); 
    while($get=mysql_fetch_array($stSQL)) { $stARRAY = $get["array2"];}
    $explodedST = explode(",", $stARRAY);
        foreach ($explodedST as $key2 => $value2) {
              if ($value2 == $SESSION) {
                      unset($explodedST[$key2]);
              }
        }
         $newST = implode(",", $explodedST);
     $sql = mysql_query("UPDATE TABLE_TWO SET array2 ='$newST' WHERE id='$value2'");

}
exit();

Please help!!! I'm really struggling on it. I have tried it for hours now and i havent really got any where. I think the problem is with the inserting to database. Please help.

You can avoid one loop by using the array1 in your second SQL directly since it is already a comma seperated list.

Try this: EDIT: Updated the code after testing.

    $SESSION['ID'] = 4;

$depSQL = mysql_query("SELECT array1 FROM TABLE1 WHERE id='".$SESSION['ID']."' LIMIT 1"); 

while($row=mysql_fetch_array($depSQL)) 
{ 
    $depARRAY = $row["array1"]; 
}
$stSQL = mysql_query("SELECT id, array2 FROM TABLE2 WHERE id IN ($depARRAY)") or die("Query Error"); 
while($get=mysql_fetch_array($stSQL)) { 
    $stARRAY = $get["array2"];
         $id =  $get["id"];
    $explodedST = explode(",", $stARRAY);
    foreach ($explodedST as $key2 => $value2) {
            if ($value2 == $SESSION['ID']) {
                            unset($explodedST[$key2]);
            }
    }
    $newST = implode(",", $explodedST);
    echo $id . " " . $newST . "<BR/>" ;
    $sql = mysql_query("UPDATE TABLE2 SET array2 ='$newST' WHERE id='$id'");
}
exit();

$SESSION is an array you can not assign value like this $SESSION = 4;

assign value like this

$SESSION['id'] = 4;
if ($value2 == $SESSION['id']) {